

A227677


Number of nX4 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X5 binary array having an odd sum, with rows and columns of the latter in lexicographically nondecreasing order


1



11, 131, 1343, 11971, 90884, 592791, 3380440, 17161921, 78807477, 331649881, 1292860261, 4709556398, 16147197916, 52422604429, 161978060979, 478412562214, 1355794408584, 3698766477709, 9741946309658, 24835300279682, 61420677587519
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OFFSET

1,1


COMMENTS



LINKS



FORMULA

Empirical polynomial of degree 30 (see link above)


EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



