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A254915 Number of (n+2)X(1+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 and vertically 2
512, 2812, 14184, 65548, 294960, 1302500, 5646340, 24197932, 102910460, 435448220, 1835734148, 7717606664, 32383016692, 135697390944, 568079847724, 2376537629288, 9937162336296, 41536068400632, 173571311968704 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A254922
LINKS
FORMULA
Empirical: a(n) = 7*a(n-1) -13*a(n-2) +11*a(n-3) -13*a(n-4) -60*a(n-5) -32*a(n-6) +210*a(n-7) +501*a(n-8) -221*a(n-9) +109*a(n-10) -981*a(n-11) -1875*a(n-12) +1430*a(n-13) +856*a(n-14) -180*a(n-15) +468*a(n-16) -216*a(n-17)
EXAMPLE
Some solutions for n=4
..0..1..0....1..0..1....1..1..1....1..0..0....0..1..0....1..0..0....0..0..0
..1..1..0....0..0..0....1..0..0....0..0..0....0..0..0....1..1..0....0..0..1
..1..1..0....1..1..0....0..0..1....0..0..0....0..0..1....1..0..0....0..0..1
..1..1..0....1..1..1....1..1..1....0..1..0....1..0..0....1..0..0....0..0..1
..1..0..0....1..1..1....0..1..0....1..0..1....0..1..0....1..1..0....0..0..0
..0..0..0....0..1..1....0..1..1....0..0..1....1..1..0....0..1..1....1..1..1
CROSSREFS
Sequence in context: A258530 A254922 A254253 * A257154 A254743 A254736
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 10 2015
STATUS
approved

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Last modified April 23 01:11 EDT 2024. Contains 371906 sequences. (Running on oeis4.)