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 1-4 of 4 results.

A188450 Number of (2*n)Xn binary arrays with nonzero rows in decreasing order, no more than 3 ones in any row and exactly 2 ones in every column.

Original entry on oeis.org

0, 1, 8, 66, 722, 9955, 165252, 3221806, 72445292, 1851203574, 53113148720, 1694163830194, 59579694687012
Offset: 1

Views

Author

R. H. Hardin Mar 31 2011

Keywords

Comments

Row 2 of A188449

Examples

			Some solutions for 6X3
..1..1..1....1..1..0....1..1..1....1..0..1....1..1..0....1..1..1....1..1..1
..1..0..1....1..0..1....1..0..0....1..0..0....1..0..1....1..0..0....1..1..0
..0..1..0....0..1..0....0..1..1....0..1..1....0..1..1....0..1..0....0..0..1
..0..0..0....0..0..1....0..0..0....0..1..0....0..0..0....0..0..1....0..0..0
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0

A188451 Number of (3*n)Xn binary arrays with nonzero rows in decreasing order, no more than 3 ones in any row and exactly 3 ones in every column.

Original entry on oeis.org

0, 0, 5, 139, 4944, 244490, 15980350, 1330789145, 137418347276, 17218246261956
Offset: 1

Views

Author

R. H. Hardin Mar 31 2011

Keywords

Comments

Row 3 of A188449

Examples

			All solutions for 9X3
..1..1..1....1..1..1....1..1..0....1..1..1....1..1..1
..1..0..1....1..1..0....1..0..1....1..1..0....1..1..0
..1..0..0....1..0..1....1..0..0....1..0..0....1..0..1
..0..1..1....0..1..0....0..1..1....0..1..1....0..1..1
..0..1..0....0..0..1....0..1..0....0..0..1....0..0..0
..0..0..0....0..0..0....0..0..1....0..0..0....0..0..0
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0

A188452 Number of (4*n)Xn binary arrays with nonzero rows in decreasing order, no more than 3 ones in any row and exactly 4 ones in every column.

Original entry on oeis.org

0, 0, 1, 139, 16683, 2876300, 703845255, 235994839738, 105035943170557
Offset: 1

Views

Author

R. H. Hardin Mar 31 2011

Keywords

Comments

Row 4 of A188449

Examples

			All solutions for 12X3
..1..1..1
..1..1..0
..1..0..1
..1..0..0
..0..1..1
..0..1..0
..0..0..1
..0..0..0
..0..0..0
..0..0..0
..0..0..0
..0..0..0

A188453 Number of (5*n)Xn binary arrays with nonzero rows in decreasing order, no more than 3 ones in any row and exactly 5 ones in every column.

Original entry on oeis.org

0, 0, 0, 66, 30090, 18014566, 15978843654, 20633840650794
Offset: 1

Views

Author

R. H. Hardin Mar 31 2011

Keywords

Comments

Row 5 of A188449
Showing 1-4 of 4 results.

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