A188394 Number of (8*n) X n binary arrays with rows in nonincreasing order and 8 ones in every column.

1, 9, 625, 411180, 2067951459, 56145844958803, 5878897478976883089, 1831628658711424019558504, 1413561739206881774907508536243, 2374109597657754735102006133988615563, 7893915426933380799680357236645251399639715, 48348427353106609781034833166459980023688120512638

Offset

1,2

Links

Table of n, a(n) for n=1..12.

Example

All solutions for 16 X 2:
..1..1....1..1....1..1....1..1....1..0....1..1....1..1....1..1....1..1
..1..1....1..1....1..0....1..1....1..0....1..1....1..1....1..1....1..1
..1..1....1..1....1..0....1..0....1..0....1..1....1..1....1..1....1..1
..1..1....1..1....1..0....1..0....1..0....1..1....1..1....1..0....1..1
..1..1....1..1....1..0....1..0....1..0....1..1....1..0....1..0....1..1
..1..1....1..0....1..0....1..0....1..0....1..1....1..0....1..0....1..1
..1..1....1..0....1..0....1..0....1..0....1..0....1..0....1..0....1..1
..1..1....1..0....1..0....1..0....1..0....1..0....1..0....1..0....1..0
..0..0....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1
..0..0....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..0
..0..0....0..1....0..1....0..1....0..1....0..0....0..1....0..1....0..0
..0..0....0..0....0..1....0..1....0..1....0..0....0..1....0..1....0..0
..0..0....0..0....0..1....0..1....0..1....0..0....0..0....0..1....0..0
..0..0....0..0....0..1....0..1....0..1....0..0....0..0....0..0....0..0
..0..0....0..0....0..1....0..0....0..1....0..0....0..0....0..0....0..0
..0..0....0..0....0..0....0..0....0..1....0..0....0..0....0..0....0..0

Crossrefs

Row 8 of A188392.

Sequence in context: A085530 A188423 A158881 * A157597 A211611 A280904

Adjacent sequences: A188391 A188392 A188393 * A188395 A188396 A188397

Keyword

nonn

Author

R. H. Hardin, Mar 30 2011

Extensions

a(7)-a(12) from Andrew Howroyd, May 17 2020

Status

approved