A258529 - OEIS

A258529

Number of (n+2)X(7+2) 0..1 arrays with every 3X3 subblock sum of the two maximums of the central row and central column plus the two minimums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally

5646340, 85453855, 606576800, 455126938, 1319588040, 2229175182, 6279181504, 24590578112, 74615867948, 254672251620, 915694420572, 3440264796428, 11988270391004, 46671912507372, 175174970747004, 672219663494924

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OFFSET

1,1

COMMENTS

Column 7 of A258530

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +19*a(n-2) -46*a(n-3) -184*a(n-4) -384*a(n-5) +2800*a(n-6) -32*a(n-7) -8320*a(n-8) +27136*a(n-9) +38400*a(n-10) -120832*a(n-11) -1331200*a(n-12) +1327104*a(n-13) +5701632*a(n-14) +2752512*a(n-15) -20971520*a(n-16) -20971520*a(n-17) +67108864*a(n-18) -33554432*a(n-19) for n>30

EXAMPLE

Some solutions for n=1

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

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

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

CROSSREFS

Cf. A258530

Sequence in context: A114685 A234174 A258536 * A254921 A290162 A251018

Adjacent sequences: A258526 A258527 A258528 * A258530 A258531 A258532

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 02 2015

STATUS

approved