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A223946 Number of nX5 0..1 arrays with diagonals and antidiagonals unimodal and rows nondecreasing 1
6, 36, 157, 558, 1821, 5951, 20275, 71653, 257568, 928047, 3335267, 11962223, 42897410, 153982177, 553329976, 1989825264, 7158056447, 25752911149, 92656210922, 333378246553, 1199549630143, 4316356194035, 15532107553777 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A223949

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 6*a(n-1) -9*a(n-2) -a(n-3) +11*a(n-4) -7*a(n-5) +12*a(n-6) -51*a(n-7) -91*a(n-8) -171*a(n-9) +353*a(n-10) +89*a(n-11) +73*a(n-12) +177*a(n-13) +22*a(n-14) -64*a(n-15) -24*a(n-16)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A001117 A224149 A055404 * A223919 A263952 A281394

Adjacent sequences:  A223943 A223944 A223945 * A223947 A223948 A223949

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 29 2013

STATUS

approved

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Last modified April 6 21:24 EDT 2020. Contains 333286 sequences. (Running on oeis4.)