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A250582 Number of (n+1)X(7+1) 0..1 arrays with nondecreasing max(x(i,j),x(i,j-1)) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction 1
1428, 4009, 9346, 20510, 44104, 94623, 203560, 441215, 963419, 2122436, 4711190, 10539254, 23725417, 53732313, 122262118, 279395064, 640562123, 1472887183, 3394038277, 7835913688, 18116152652, 41934181304, 97151672669, 225248699646 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A250583

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) -20*a(n-2) -5*a(n-3) +113*a(n-4) -184*a(n-5) -13*a(n-6) +366*a(n-7) -407*a(n-8) +49*a(n-9) +244*a(n-10) -210*a(n-11) +59*a(n-12) +7*a(n-13) -7*a(n-14) +a(n-15) for n>19

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A068572 A236897 A163589 * A260283 A156853 A292704

Adjacent sequences:  A250579 A250580 A250581 * A250583 A250584 A250585

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 25 2014

STATUS

approved

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Last modified September 24 06:13 EDT 2021. Contains 347623 sequences. (Running on oeis4.)