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 1-10 of 12 results. Next

A221323 Number of n X 3 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

Original entry on oeis.org

7, 119, 2008, 33873, 571358, 9637322, 162555929, 2741882383, 46248186229, 780082534460, 13157894317753, 221938287447408, 3743501973486176, 63142809559541159, 1065049364666447387, 17964518161956501475
Offset: 1

Views

Author

R. H. Hardin, Jan 11 2013

Keywords

Comments

Column 3 of A221328.

Examples

			Some solutions for n=3:
..2..1..0....2..2..0....1..1..0....1..1..1....2..1..0....1..0..1....1..0..2
..2..0..1....0..2..0....2..0..2....0..2..1....1..0..1....1..2..0....2..1..0
..1..0..2....0..1..2....0..2..1....1..0..2....2..2..0....1..2..1....0..2..1
		

Crossrefs

Cf. A221328.

Formula

Empirical: a(n) = 23*a(n-1) - 110*a(n-2) + 111*a(n-3) - 6*a(n-4) - 8*a(n-5).
Empirical g.f.: x*(1 - x)*(7 - 35*x + 6*x^2 + 8*x^3) / (1 - 23*x + 110*x^2 - 111*x^3 + 6*x^4 + 8*x^5). - Colin Barker, Aug 05 2018

A221324 Number of n X 4 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

Original entry on oeis.org

17, 866, 46105, 2460824, 131347807, 7010554450, 374176705928, 19970973695923, 1065911268786396, 56890876705125765, 3036435876484206258, 162063633563069131638, 8649818983278197229631, 461666606875092805859284
Offset: 1

Views

Author

R. H. Hardin, Jan 11 2013

Keywords

Comments

Column 4 of A221328.

Examples

			Some solutions for n=3:
..1..1..2..1....0..1..0..1....0..2..1..2....0..2..2..2....2..1..1..0
..0..0..1..2....1..2..2..2....0..0..2..0....1..0..1..2....2..0..1..1
..1..0..2..1....2..0..0..1....2..0..1..2....1..0..1..0....1..2..1..0
		

Formula

Empirical: a(n) = 91*a(n-1) -2497*a(n-2) +29072*a(n-3) -168762*a(n-4) +513070*a(n-5) -765950*a(n-6) +359339*a(n-7) +283374*a(n-8) -252113*a(n-9) -12688*a(n-10) +38079*a(n-11) -6354*a(n-12) +289*a(n-13).

A221325 Number of nX5 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

Original entry on oeis.org

41, 6328, 1010078, 162430981, 26135748494, 4205264399891, 676612123702617, 108863121975329470, 17515379016294357354, 2818106397041464685615, 453413942381102088419081, 72951161699753445110986111
Offset: 1

Views

Author

R. H. Hardin Jan 11 2013

Keywords

Comments

Column 5 of A221328

Examples

			Some solutions for n=3
..0..1..2..2..1....0..2..1..2..1....0..1..2..2..1....0..1..2..1..1
..0..2..0..1..2....0..0..2..0..2....0..2..1..2..0....0..2..0..2..1
..0..0..1..1..2....2..2..0..1..0....0..2..0..0..2....1..1..1..1..1
		

A221326 Number of nX6 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

Original entry on oeis.org

99, 46211, 22181855, 10794156688, 5264460642473, 2568131772343102, 1252783082725664892, 611119758365760669838, 298107197445873504485520, 145417480551629396888700687, 70934889022803306796027176575
Offset: 1

Views

Author

R. H. Hardin Jan 11 2013

Keywords

Comments

Column 6 of A221328

Examples

			Some solutions for n=3
..0..1..1..1..0..1....0..1..2..2..0..0....0..1..2..0..2..1....0..1..2..1..1..1
..0..2..2..2..1..0....0..2..1..1..1..2....0..1..2..2..2..0....0..1..1..2..1..0
..0..1..2..1..1..2....0..1..1..2..1..1....0..2..0..0..1..2....0..2..2..2..0..1
		

A221327 Number of nX7 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

Original entry on oeis.org

239, 337274, 487335857, 711858713069, 1043094530574190, 1529318909534974055, 2242286238164144345340, 3287567392078817733944559, 4820042020725407512778215418, 7066803372580254890277247530238
Offset: 1

Views

Author

R. H. Hardin Jan 11 2013

Keywords

Comments

Column 7 of A221328

Examples

			Some solutions for n=3
..0..1..1..1..2..1..1....0..1..1..2..2..0..0....0..1..1..1..0..2..1
..0..1..1..2..1..2..1....0..1..2..2..2..1..0....0..1..2..2..2..1..1
..0..1..1..2..1..0..1....0..1..0..2..1..1..2....0..1..1..0..1..1..2
		

A221329 Number of 2 X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

Original entry on oeis.org

1, 17, 119, 866, 6328, 46211, 337274, 2460918, 17953576, 130970758, 955393448, 6969190236, 50836821440, 370827923908, 2704988609708, 19731401249156, 143929610463264, 1049886222652688, 7658333144969252, 55863255070913284
Offset: 1

Views

Author

R. H. Hardin, Jan 11 2013

Keywords

Comments

Row 2 of A221328.

Examples

			Some solutions for n=3:
..0..1..0....1..1..1....2..0..1....2..1..0....0..1..1....2..0..2....1..0..1
..1..2..2....2..0..1....1..0..2....2..1..0....1..1..2....0..1..1....1..1..2
		

Crossrefs

Cf. A221328.

Formula

Empirical: a(n) = 11*a(n-1) - 27*a(n-2) - a(n-3) + 8*a(n-4) - 16*a(n-5) - 6*a(n-6) + 2*a(n-7) for n>9.
Empirical g.f.: x*(1 + 6*x - 41*x^2 + 17*x^3 + 24*x^4 - 16*x^5 + x^6 + 5*x^7 - x^8) / (1 - 11*x + 27*x^2 + x^3 - 8*x^4 + 16*x^5 + 6*x^6 - 2*x^7). - Colin Barker, Aug 05 2018

A221330 Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

Original entry on oeis.org

1, 99, 2008, 46105, 1010078, 22181855, 487335857, 10702699654, 234960268184, 5156938918020, 113169823744104, 2483341620801750, 54490904644158524, 1195642566518402694, 26234513648153012228, 575627427381833999655
Offset: 1

Views

Author

R. H. Hardin Jan 11 2013

Keywords

Comments

Row 3 of A221328

Examples

			Some solutions for n=3
..1..1..1....1..0..0....1..2..0....0..2..1....0..1..2....1..1..1....1..1..1
..2..0..2....2..2..1....2..1..0....0..1..2....2..2..1....2..2..0....1..0..2
..0..1..1....0..2..1....2..0..1....0..2..1....0..1..0....0..1..1....2..1..0
		

Formula

Empirical: a(n) = 41*a(n-1) -510*a(n-2) +2064*a(n-3) -290*a(n-4) -18526*a(n-5) +25526*a(n-6) +24962*a(n-7) -5089*a(n-8) +307825*a(n-9) +251112*a(n-10) +475211*a(n-11) +1516807*a(n-12) +939017*a(n-13) +282103*a(n-14) -33095*a(n-15) -762290*a(n-16) +335187*a(n-17) +743367*a(n-18) -337130*a(n-19) -221548*a(n-20) +169223*a(n-21) +5398*a(n-22) -47623*a(n-23) +5009*a(n-24) +6337*a(n-25) -804*a(n-26) -272*a(n-27) +20*a(n-28) +4*a(n-29) for n>30

A221331 Number of 4 X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

Original entry on oeis.org

1, 577, 33873, 2460824, 162430981, 10794156688, 711858713069, 46910596287335, 3089778765626866, 203426990390736036, 13389504827335440162, 881130781309712234876, 57978558022828544235124, 3814742757245230038689495
Offset: 1

Views

Author

R. H. Hardin, Jan 11 2013

Keywords

Comments

Row 4 of A221328.

Examples

			Some solutions for n=3
..2..0..1....1..2..0....2..1..1....1..1..1....1..1..0....2..0..1....1..1..2
..2..2..0....1..1..0....1..0..0....1..0..2....2..0..0....0..2..1....1..2..1
..1..0..2....1..1..0....1..2..0....0..2..0....2..2..1....1..2..1....0..1..2
..0..2..0....1..2..2....0..2..2....1..2..1....1..0..2....1..1..0....0..0..1
		

Crossrefs

Cf. A221328.

A221332 Number of 5Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

Original entry on oeis.org

1, 3363, 571358, 131347807, 26135748494, 5264460642473, 1043094530574190, 206296461646686083, 40696390245562531399, 8021014977002231894704, 1580039716596918034100062, 311140535645141827979564485
Offset: 1

Views

Author

R. H. Hardin Jan 11 2013

Keywords

Comments

Row 5 of A221328

Examples

			Some solutions for n=3
..0..1..2....0..1..1....0..1..2....0..1..2....0..2..0....0..2..0....0..1..2
..2..2..0....1..2..0....0..1..1....2..0..1....1..2..2....1..2..0....2..1..0
..0..0..1....1..1..1....1..2..1....1..0..2....0..1..1....2..1..1....2..0..0
..1..1..2....1..2..2....2..1..1....1..0..1....0..1..0....1..0..2....0..2..1
..2..0..1....0..0..2....0..1..1....2..2..0....1..2..2....2..1..0....2..1..1
		

A221322 Number of n X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

Original entry on oeis.org

1, 17, 2008, 2460824, 26135748494, 2568131772343102, 2242286238164144345340, 17596650117587793920907469032
Offset: 1

Views

Author

R. H. Hardin Jan 11 2013

Keywords

Comments

Diagonal of A221328

Examples

			Some solutions for n=3
..1..1..2....2..0..1....0..2..0....1..0..2....0..2..1....1..0..1....2..1..0
..0..0..1....1..2..1....1..2..1....1..1..0....2..0..0....1..2..1....2..1..1
..1..1..2....0..2..0....0..1..2....2..1..1....1..2..1....1..2..0....1..1..0
		
Showing 1-10 of 12 results. Next