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 1-5 of 5 results.

A196431 Number of n X 3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,0,3,4 for x=0,1,2,3,4.

Original entry on oeis.org

3, 9, 25, 75, 213, 621, 1801, 5219, 15133, 43867, 127195, 368759, 1069105, 3099583, 8986391, 26053581, 75535111, 218993223, 634910491, 1840747761, 5336740123, 15472405305, 44857970049, 130053306249, 377053674603, 1093163086545
Offset: 1

Views

Author

R. H. Hardin, Oct 02 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 1's, every 2 is next to 2 0's, every 3 is next to 3 3's, every 4 is next to 4 4's.
Column 3 of A196436.

Examples

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

Crossrefs

Cf. A196436.

Formula

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

A196432 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,0,3,4 for x=0,1,2,3,4.

Original entry on oeis.org

4, 20, 75, 314, 1283, 5311, 21803, 89640, 369032, 1517961, 6244222, 25688677, 105682189, 434759457, 1788546806, 7357898836, 30269531965, 124525282462, 512282735741, 2107472161705, 8669896311631, 35666951338042, 146729718668682
Offset: 1

Views

Author

R. H. Hardin Oct 02 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 1's, every 2 is next to 2 0's, every 3 is next to 3 3's, every 4 is next to 4 4's
Column 4 of A196436

Examples

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

Formula

Empirical: a(n) = 6*a(n-2) +26*a(n-3) +57*a(n-4) +71*a(n-5) +49*a(n-6) +43*a(n-7) +35*a(n-8) +22*a(n-9) +25*a(n-10) +11*a(n-11) -5*a(n-12) -a(n-14)

A196433 Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,0,3,4 for x=0,1,2,3,4.

Original entry on oeis.org

6, 41, 213, 1283, 7358, 42604, 246463, 1427278, 8257394, 47782109, 276548288, 1600318316, 9261110693, 53594650946, 310152403800, 1794861048704, 10386914552975, 60109320907593, 347854219621911, 2013041621414557
Offset: 1

Views

Author

R. H. Hardin Oct 02 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 1's, every 2 is next to 2 0's, every 3 is next to 3 3's, every 4 is next to 4 4's
Column 5 of A196436

Examples

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

Formula

Empirical: a(n) = 2*a(n-1) +10*a(n-2) +53*a(n-3) +82*a(n-4) +111*a(n-5) -129*a(n-6) -827*a(n-7) -1254*a(n-8) +2309*a(n-9) +2065*a(n-10) -3149*a(n-11) -3500*a(n-12) +4105*a(n-13) +5856*a(n-14) -8008*a(n-15) +1008*a(n-16) +5189*a(n-17) -1830*a(n-18) -2683*a(n-19) +2403*a(n-20) +8398*a(n-21) -10099*a(n-22) +2582*a(n-23) -6932*a(n-24) +4579*a(n-25) -1024*a(n-26) +641*a(n-27) -588*a(n-28) +234*a(n-29) -402*a(n-30) +159*a(n-31) -79*a(n-32) +60*a(n-33) -5*a(n-34) +3*a(n-35) -a(n-36)

A196434 Number of nX6 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,0,3,4 for x=0,1,2,3,4.

Original entry on oeis.org

9, 85, 621, 5311, 42604, 349511, 2856711, 23313460, 190423461, 1555501171, 12704412662, 103763056849, 847501887506, 6922062563622, 56536822184240, 461770332107532, 3771561120301804, 30804663686920140, 251600540889179023
Offset: 1

Views

Author

R. H. Hardin Oct 02 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 1's, every 2 is next to 2 0's, every 3 is next to 3 3's, every 4 is next to 4 4's
Column 6 of A196436

Examples

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

Formula

Empirical: a(n) = 3*a(n-1) +25*a(n-2) +133*a(n-3) +160*a(n-4) -228*a(n-5) -4347*a(n-6) -6390*a(n-7) +22042*a(n-8) +69473*a(n-9) -121351*a(n-10) -166866*a(n-11) +99488*a(n-12) +403431*a(n-13) +573755*a(n-14) -459164*a(n-15) -3331885*a(n-16) +882345*a(n-17) +10267362*a(n-18) -10417263*a(n-19) +1297172*a(n-20) -12680768*a(n-21) +28807056*a(n-22) +10288169*a(n-23) -42690735*a(n-24) -80670630*a(n-25) +131547842*a(n-26) +171329522*a(n-27) -592636916*a(n-28) +854087725*a(n-29) -1000480787*a(n-30) +1181403998*a(n-31) -1469943639*a(n-32) +1174515719*a(n-33) -815203545*a(n-34) +676224576*a(n-35) -204277861*a(n-36) +154628965*a(n-37) -31210484*a(n-38) -83098378*a(n-39) +84233332*a(n-40) +75103457*a(n-41) +28535852*a(n-42) +26793544*a(n-43) -25032839*a(n-44) +14612191*a(n-45) +3404438*a(n-46) +11277482*a(n-47) +4472344*a(n-48) +4553725*a(n-49) -8053851*a(n-50) +5355502*a(n-51) -5356445*a(n-52) +3186418*a(n-53) -4432672*a(n-54) +84462*a(n-55) -1407676*a(n-56) +477617*a(n-57) +72338*a(n-58) +149289*a(n-59) -20471*a(n-60) -2699*a(n-61) -5568*a(n-62) +587*a(n-63) +504*a(n-64) +283*a(n-65) -29*a(n-66) -27*a(n-67) -4*a(n-68) +a(n-69)

A196435 Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,0,3,4 for x=0,1,2,3,4.

Original entry on oeis.org

13, 178, 1801, 21803, 246463, 2856711, 32855368, 378154308, 4356726770, 50163397373, 577634629068, 6651858481248, 76599144629883, 882067405853789, 10157379663581632, 116966622243380304, 1346919921065307751
Offset: 1

Views

Author

R. H. Hardin Oct 02 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 1's, every 2 is next to 2 0's, every 3 is next to 3 3's, every 4 is next to 4 4's
Column 7 of A196436

Examples

			Some solutions for n=4
..1..0..0..0..0..0..0....0..0..1..0..1..0..0....1..1..0..0..1..1..0
..1..0..0..0..0..1..1....0..0..1..0..1..0..0....0..0..1..1..0..0..0
..0..0..0..0..0..0..0....0..0..0..0..0..0..0....1..1..0..0..0..0..1
..0..1..1..0..0..0..0....0..1..1..0..1..1..0....0..0..1..1..0..0..1
		
Showing 1-5 of 5 results.