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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 1
5646340, 85453855, 606576800, 455126938, 1319588040, 2229175182, 6279181504, 24590578112, 74615867948, 254672251620, 915694420572, 3440264796428, 11988270391004, 46671912507372, 175174970747004, 672219663494924 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A258530
LINKS
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
Sequence in context: A114685 A234174 A258536 * A254921 A290162 A251018
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 02 2015
STATUS
approved

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)