A188446 Number of (4*n) X n binary arrays with nonzero rows in decreasing order and 4 ones in every column.

1, 0, 0, 1, 278, 67198, 24537905, 13744869502, 11385203921707, 13429702800066408, 21828741452174445770, 47540906064229854124913, 135469436416591290078176485, 494882516747849393466094870718, 2277287830010010200588821272208162, 13000224127787800362702159372817442122

Offset

0,5

Links

Andrew Howroyd, Table of n, a(n) for n = 0..50

Example

Some solutions for 16 X 4:
  1 1 1 0     1 1 1 1     1 1 1 1     1 1 1 1     1 1 1 0
  1 1 0 1     1 0 1 0     1 1 1 0     1 1 1 0     1 1 0 0
  1 0 1 0     1 0 0 1     1 0 1 1     1 0 1 0     1 0 1 1
  1 0 0 1     1 0 0 0     1 0 0 0     1 0 0 1     1 0 0 1
  0 1 1 0     0 1 1 1     0 1 0 1     0 1 0 1     0 1 1 0
  0 1 0 1     0 1 1 0     0 1 0 0     0 1 0 0     0 1 0 1
  0 0 1 1     0 1 0 0     0 0 1 1     0 0 1 0     0 0 1 0
  0 0 0 0     0 0 0 1     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 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     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 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

Crossrefs

Row 4 of A188445.

Sequence in context: A257368 A056995 A228135 * A251624 A062384 A053345

Adjacent sequences: A188443 A188444 A188445 * A188447 A188448 A188449

Keyword

nonn

Author

R. H. Hardin, Mar 31 2011

Extensions

a(0)=1 prepended and terms a(9) and beyond from Andrew Howroyd, Dec 15 2018

Status

approved