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A223643 Number of nX7 0..1 arrays with rows, columns, diagonals and antidiagonals unimodal 1
29, 841, 10797, 74599, 354726, 1370104, 4682514, 14767708, 43862845, 124004457, 335617558, 872372014, 2182675327, 5267049151, 12280118231, 27708360959, 60600014150, 128659653568, 265553503693, 533599565121, 1045268782162 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A223644

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..78

FORMULA

Empirical: a(n) = (503/209563200)*n^14 - (185069/778377600)*n^13 + (1733819/119750400)*n^12 - (7176551/11975040)*n^11 + (36644381/2177280)*n^10 - (480531353/1814400)*n^9 - (76780811581/76204800)*n^8 + (29262582467/155520)*n^7 - (62420351374933/10886400)*n^6 + (281872655928541/2721600)*n^5 - (74234681724454753/59875200)*n^4 + (3261809312979967/332640)*n^3 - (557318597695013723/11642400)*n^2 + (14542780178794541/120120)*n - 90173668357 for n>19

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A218731 A171334 A097782 * A223668 A223636 A223619

Adjacent sequences:  A223640 A223641 A223642 * A223644 A223645 A223646

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 2013

STATUS

approved

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Last modified November 27 12:35 EST 2021. Contains 349394 sequences. (Running on oeis4.)