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A180991 Number of (n+2)xn binary matrices with rows and then columns in strictly increasing order as binary numbers 0
0, 0, 4, 196, 17630, 3673129, 1986193307, 3003748718884, 13426920301736657, 185166591284225200707, 8146406517582852344067961, 1173623326436235078315237985776 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Subdiagonal 2 of A180989

LINKS

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

EXAMPLE

All solutions for 5X3

..0..0..0....0..0..1....0..0..1....0..1..1

..0..1..1....0..1..0....0..1..1....1..0..0

..1..0..0....1..0..0....1..0..0....1..0..1

..1..0..1....1..0..1....1..0..1....1..1..0

..1..1..0....1..1..0....1..1..0....1..1..1

CROSSREFS

Sequence in context: A017546 A144044 A221197 * A279803 A209288 A263422

Adjacent sequences:  A180988 A180989 A180990 * A180992 A180993 A180994

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 30 2010

STATUS

approved

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Last modified August 25 16:17 EDT 2019. Contains 326324 sequences. (Running on oeis4.)