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.

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A267250 Number of 7Xn binary arrays with row sums nondecreasing and columns lexicographically nondecreasing.

Original entry on oeis.org

8, 255, 5804, 129129, 2499080, 43555569, 683027146, 9748574556, 127531124302, 1540596418525, 17291858116440, 181338323456395, 1785428392643952, 16575758386318547
Offset: 1

Views

Author

R. H. Hardin, Jan 12 2016

Keywords

Comments

Row 7 of A267245.

Examples

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

Crossrefs

Cf. A267245.
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