cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-7 of 7 results.

A196204 Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,3,4,1 for x=0,1,2,3,4.

Original entry on oeis.org

3, 5, 8, 11, 18, 28, 43, 67, 105, 164, 257, 404, 636, 1003, 1585, 2509, 3978, 6317, 10046, 15998, 25509, 40723, 65083, 104122, 166737, 267242, 428678, 688151, 1105443, 1776907, 2857894, 4598959, 7404324, 11926298, 19217795, 30978737, 49954191
Offset: 1

Views

Author

R. H. Hardin, Sep 29 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 0's, every 2 is next to 2 3's, every 3 is next to 3 4's, every 4 is next to 4 1's.
Column 2 of A196210.

Examples

			Some solutions for n=4:
..0..0....0..1....1..0....1..0....0..1....0..0....1..1....1..0....0..1....0..0
..0..0....0..1....1..0....1..1....0..1....1..1....0..0....1..0....1..1....0..0
..0..0....1..1....1..1....0..1....0..1....1..1....0..0....1..0....1..0....0..0
..1..1....1..0....0..1....0..1....0..1....0..0....0..0....1..0....1..0....0..0
		

Crossrefs

Cf. A196210.

Formula

Empirical: a(n) = 2*a(n-1) - a(n-4) - a(n-5).
Empirical g.f.: x*(1 + x + x^2)*(3 - 4*x - x^2) / ((1 - x - x^2)*(1 - x - x^3)). - Colin Barker, Mar 01 2018

A196205 Number of n X 3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,3,4,1 for x=0,1,2,3,4.

Original entry on oeis.org

4, 8, 7, 14, 17, 27, 42, 58, 94, 137, 208, 319, 477, 732, 1108, 1686, 2573, 3912, 5975, 9113, 13914, 21268, 32504, 49733, 76116, 116561, 178607, 273786, 419924, 644346, 989153, 1519164, 2334105, 3587703, 5516702, 8486022, 13058268, 20100879
Offset: 1

Views

Author

R. H. Hardin, Sep 29 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 0's, every 2 is next to 2 3's, every 3 is next to 3 4's, every 4 is next to 4 1's.
Column 3 of A196210.

Examples

			Some solutions for n=4:
..1..1..0....1..0..0....1..0..1....1..0..0....1..1..1....1..1..1....0..0..0
..0..1..1....1..0..0....1..0..1....1..1..1....0..0..0....0..0..0....0..0..0
..0..1..1....1..0..0....1..0..1....0..1..1....0..0..0....0..0..0....0..0..0
..1..1..0....1..0..0....1..0..1....1..1..0....0..0..0....1..1..1....1..1..1
		

Crossrefs

Cf. A196210.

Formula

Empirical: a(n) = 3*a(n-1) - 2*a(n-2) - 2*a(n-4) + 3*a(n-5) - 2*a(n-6) + 2*a(n-7) - 2*a(n-8) + a(n-9).
Empirical g.f.: x*(4 - 4*x - 9*x^2 + 9*x^3 - 3*x^4 + 8*x^5 - 7*x^6 + x^7 + 2*x^8) / ((1 - x)*(1 - x - x^3)*(1 - x - x^2 + x^4 - x^5)). - Colin Barker, Mar 01 2018

A196206 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,3,4,1 for x=0,1,2,3,4.

Original entry on oeis.org

5, 11, 14, 35, 70, 136, 305, 611, 1321, 2832, 6041, 12936, 27706, 59515, 128053, 275195, 591576, 1272021, 2736374, 5887462, 12665855, 27247361, 58620223, 126125420, 271372681, 583876552, 1256241214, 2702904009, 5815589949
Offset: 1

Views

Author

R. H. Hardin Sep 29 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 0's, every 2 is next to 2 3's, every 3 is next to 3 4's, every 4 is next to 4 1's
Column 4 of A196210

Examples

			Some solutions for n=5
..1..1..0..0....1..1..0..1....0..0..0..0....0..1..1..0....0..0..1..1
..0..1..1..1....0..1..1..1....0..0..0..0....1..1..1..0....1..1..1..0
..1..1..1..1....1..4..1..0....0..0..0..0....1..0..1..1....1..1..4..1
..1..0..0..0....1..1..1..0....0..0..0..0....1..1..4..1....0..0..1..1
..1..0..0..0....0..0..1..1....0..0..0..0....0..1..1..0....1..1..1..0
		

Formula

Empirical: a(n) = 4*a(n-1) -6*a(n-2) +7*a(n-3) -5*a(n-4) -a(n-5) -a(n-6) -6*a(n-7) +12*a(n-8) -2*a(n-9) +18*a(n-10) -29*a(n-11) +12*a(n-12) -2*a(n-13) -4*a(n-14) +16*a(n-15) -9*a(n-16) +7*a(n-17) -4*a(n-18) -3*a(n-19)

A196207 Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,3,4,1 for x=0,1,2,3,4.

Original entry on oeis.org

8, 18, 17, 70, 135, 301, 751, 1774, 4243, 10211, 24823, 60093, 145378, 351699, 855562, 2076868, 5030512, 12211093, 29679181, 72051591, 174807032, 424556639, 1031502532, 2504434609, 6080193626, 14768788766, 35874049343, 87112767731
Offset: 1

Views

Author

R. H. Hardin Sep 29 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 0's, every 2 is next to 2 3's, every 3 is next to 3 4's, every 4 is next to 4 1's
Column 5 of A196210

Examples

			Some solutions for n=4
..1..1..0..1..1....0..1..1..1..0....0..1..1..0..0....1..0..0..1..1
..0..1..1..1..0....1..1..0..1..1....1..4..1..0..0....1..1..1..1..0
..1..1..4..1..0....1..1..1..4..1....1..1..1..0..0....0..1..4..1..1
..1..0..1..1..0....0..0..1..1..0....0..0..1..1..1....0..1..1..0..1
		

Formula

Empirical: a(n) = 5*a(n-1) -8*a(n-2) +9*a(n-3) -12*a(n-4) -19*a(n-5) +49*a(n-6) +30*a(n-7) -58*a(n-8) -64*a(n-9) +48*a(n-10) +26*a(n-11) +140*a(n-12) -233*a(n-13) +158*a(n-14) -44*a(n-15) +183*a(n-16) -909*a(n-17) +641*a(n-18) +576*a(n-19) -625*a(n-20) +199*a(n-21) -562*a(n-22) +91*a(n-23) +37*a(n-24) +373*a(n-25) +87*a(n-26) -160*a(n-27) -200*a(n-28) +116*a(n-29) +59*a(n-30) +70*a(n-31) +95*a(n-32) -176*a(n-33) +143*a(n-34) -71*a(n-35) -33*a(n-36) +62*a(n-37) -60*a(n-38) +36*a(n-39) -8*a(n-40) for n>42

A196208 Number of nX6 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,3,4,1 for x=0,1,2,3,4.

Original entry on oeis.org

12, 28, 27, 136, 301, 899, 2922, 7680, 24326, 71539, 213378, 637327, 1919823, 5779272, 17262590, 52036278, 156828887, 470650712, 1416414013, 4267310387, 12839872102, 38624812870, 116319554088, 350228413447, 1053958512376
Offset: 1

Views

Author

R. H. Hardin Sep 29 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 0's, every 2 is next to 2 3's, every 3 is next to 3 4's, every 4 is next to 4 1's
Column 6 of A196210

Examples

			Some solutions for n=4
..1..1..1..0..0..0....0..0..1..1..1..0....1..0..0..1..1..0....0..0..0..1..1..0
..0..0..1..1..1..1....1..1..1..0..1..1....1..1..1..1..1..1....1..1..1..4..1..1
..0..0..1..1..1..1....1..1..4..1..1..1....0..1..1..0..0..1....1..1..4..1..0..1
..1..1..1..0..0..0....0..0..1..1..0..0....0..1..1..0..0..1....0..0..1..1..0..1
		

Formula

Empirical: a(n) = 8*a(n-1) -25*a(n-2) +49*a(n-3) -98*a(n-4) +156*a(n-5) -51*a(n-6) -144*a(n-7) -341*a(n-8) +1389*a(n-9) -660*a(n-10) -2333*a(n-11) +5139*a(n-12) -11346*a(n-13) +24800*a(n-14) -27702*a(n-15) +12247*a(n-16) -24515*a(n-17) +78061*a(n-18) -110507*a(n-19) +184911*a(n-20) -438580*a(n-21) +655447*a(n-22) -648567*a(n-23) +862703*a(n-24) -1279249*a(n-25) +943400*a(n-26) -303171*a(n-27) +399709*a(n-28) +738397*a(n-29) -4142609*a(n-30) +6009546*a(n-31) -6565856*a(n-32) +10435723*a(n-33) -11726109*a(n-34) +6696327*a(n-35) -6600308*a(n-36) +8923058*a(n-37) +3277094*a(n-38) -13169182*a(n-39) +2924924*a(n-40) -2391459*a(n-41) +2784495*a(n-42) +22739414*a(n-43) -17311996*a(n-44) -27321912*a(n-45) +40260403*a(n-46) -36180202*a(n-47) +43830773*a(n-48) -8581300*a(n-49) -51992396*a(n-50) +26174979*a(n-51) -3774353*a(n-52) +6668033*a(n-53) +33995202*a(n-54) -23256231*a(n-55) -21376770*a(n-56) +26998688*a(n-57) -26948542*a(n-58) +22456734*a(n-59) +8614698*a(n-60) -19136774*a(n-61) +8512190*a(n-62) -6807667*a(n-63) -2849975*a(n-64) +5384596*a(n-65) -270938*a(n-66) -3553395*a(n-67) +2756797*a(n-68) -1928086*a(n-69) -5467*a(n-70) +2507989*a(n-71) -597526*a(n-72) +697798*a(n-73) +575841*a(n-74) -274754*a(n-75) +475607*a(n-76) +277687*a(n-77) +39593*a(n-78) +218097*a(n-79) -20820*a(n-80) -7030*a(n-81) +5344*a(n-82) -15392*a(n-83) +958*a(n-84) +7496*a(n-85) -306*a(n-86) +3137*a(n-87) +695*a(n-88) -164*a(n-89) +105*a(n-90) -65*a(n-91) -25*a(n-92)

A196209 Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,3,4,1 for x=0,1,2,3,4.

Original entry on oeis.org

17, 43, 42, 305, 751, 2922, 10986, 35529, 128823, 472599, 1687338, 6179264, 22255717, 79844666, 288974977, 1050069655, 3810469340, 13776469497, 49876710085, 180636295947, 654371189198, 2372238997568, 8596886259187
Offset: 1

Views

Author

R. H. Hardin Sep 29 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 0's, every 2 is next to 2 3's, every 3 is next to 3 4's, every 4 is next to 4 1's
Column 7 of A196210

Examples

			Some solutions for n=4
..1..0..0..1..1..0..0....0..1..1..0..0..0..0....0..1..1..0..1..1..0
..1..1..1..4..1..0..0....0..1..4..1..1..1..1....1..4..1..0..1..1..0
..0..1..4..1..1..0..0....1..1..1..1..1..1..1....1..1..4..1..1..1..1
..0..1..1..0..1..1..1....1..0..0..0..0..0..0....0..0..1..1..0..0..1
		

A196203 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,0,3,4,1 for x=0,1,2,3,4.

Original entry on oeis.org

1, 5, 7, 35, 135, 899, 10986, 136967, 3421139, 111262773, 5717068140, 412501303097, 44874896809668
Offset: 1

Views

Author

R. H. Hardin, Sep 29 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 0's, every 2 is next to 2 3's, every 3 is next to 3 4's, every 4 is next to 4 1's.
Diagonal of A196210.

Examples

			Some solutions for n=4
..0..0..1..1....1..0..0..0....1..1..0..0....0..0..0..1....0..1..1..0
..1..1..1..0....1..0..0..0....0..1..1..1....0..0..0..1....0..1..4..1
..1..4..1..0....1..0..0..0....1..1..1..1....0..0..0..1....1..1..1..1
..0..1..1..0....1..0..0..0....1..0..0..0....0..0..0..1....1..0..0..0
		

Crossrefs

Cf. A196210.
Showing 1-7 of 7 results.