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 1-6 of 6 results.

A221134 Number of nX3 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.

Original entry on oeis.org

2, 49, 656, 12544, 200072, 3485689, 58132316, 990486784, 16699002692, 282999528529, 4783766470826, 80965479678724, 1369496232351362, 23171487659654569, 391996208325992186, 6631958618350959364
Offset: 1

Views

Author

R. H. Hardin Jan 02 2013

Keywords

Comments

Column 3 of A221139

Examples

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

Formula

Empirical: a(n) = 21*a(n-1) -1450*a(n-3) +4782*a(n-4) -372*a(n-5) +1450*a(n-6) +69*a(n-8) +a(n-9)

A221135 Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.

Original entry on oeis.org

4, 289, 12544, 643204, 31203396, 1539699121, 75512292025, 3709710975721, 182118668668225, 8941989810789025, 439009303948483984, 21553427021714858449, 1058163003670012270144, 51950295646215686851681
Offset: 1

Views

Author

R. H. Hardin Jan 02 2013

Keywords

Comments

Column 4 of A221139

Examples

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

A221136 Number of nX5 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.

Original entry on oeis.org

8, 1681, 200072, 31203396, 4235650596, 619901126244, 86907967843320, 12474883501876324, 1766575491615801750, 252036106134604983844, 35804312825751223799132, 5098360123415675049888964
Offset: 1

Views

Author

R. H. Hardin Jan 02 2013

Keywords

Comments

Column 5 of A221139

Examples

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

A221133 Number of n X n arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.

Original entry on oeis.org

0, 9, 656, 643204, 4235650596, 259039174953636
Offset: 1

Views

Author

R. H. Hardin Jan 02 2013

Keywords

Comments

Diagonal of A221139

Examples

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

A221137 Number of nX6 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.

Original entry on oeis.org

16, 9801, 3485689, 1539699121, 619901126244, 259039174953636, 106295637843093924, 43910419047705413284
Offset: 1

Views

Author

R. H. Hardin Jan 02 2013

Keywords

Comments

Column 6 of A221139

Examples

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

A221138 Number of n X 7 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.

Original entry on oeis.org

32, 57121, 58132316, 75512292025, 86907967843320, 106295637843093924
Offset: 1

Views

Author

R. H. Hardin Jan 02 2013

Keywords

Comments

Column 7 of A221139.

Examples

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

Crossrefs

Cf. A221139.
Showing 1-6 of 6 results.