A188388 Number of (n^2) X n binary arrays with rows in nonincreasing order and n ones in every column.

1, 3, 39, 4079, 5442547, 135029200594, 85864898797026630, 1831628658711424019558504, 1644974303630818355119787542346815, 75615488905118998567211473141942014485626339

Offset

1,2

Links

Table of n, a(n) for n=1..10.

Example

All solutions for 4X2
..1..1....1..0....1..1
..1..1....1..0....1..0
..0..0....0..1....0..1
..0..0....0..1....0..0

Mathematica

A188392 = Cases[Import["https://oeis.org/A188392/b188392.txt", "Table"], {_, _}][[All, 2]];
a[n_] := A188392[[2 n^2 - 2 n + 1]];
Table[a[n], {n, 1, 10}] (* Jean-François Alcover, Sep 23 2019 *)

Crossrefs

Main diagonal of A188392.

Sequence in context: A342178 A342166 A188410 * A076628 A198411 A367033

Adjacent sequences: A188385 A188386 A188387 * A188389 A188390 A188391

Keyword

nonn

Author

R. H. Hardin, Mar 30 2011

Extensions

More terms from Jean-François Alcover, Sep 23 2019

Status

approved