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A254900 Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two minimums of the central column and central row nondecreasing horizontally, vertically and ne-to-sw antidiagonally 2
512, 2423, 7579, 22901, 72249, 219706, 616608, 1656147, 4391684, 11530065, 29828022, 76080145, 191906132, 479966380, 1193306087, 2951733688, 7264247735, 17792959607, 43422206773, 105672171019, 256535475334, 621345009200 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A254907

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) -17*a(n-2) +17*a(n-3) +a(n-4) -50*a(n-5) +65*a(n-6) +89*a(n-7) -180*a(n-8) +167*a(n-9) +282*a(n-10) -1618*a(n-11) +638*a(n-12) +1824*a(n-13) -5732*a(n-14) +14128*a(n-15) -14024*a(n-16) +19140*a(n-17) -28304*a(n-18) +24392*a(n-19) -30824*a(n-20) -7456*a(n-21) +46368*a(n-22) -51936*a(n-23) +69856*a(n-24) -70176*a(n-25) +230336*a(n-26) -527488*a(n-27) +862080*a(n-28) -1031040*a(n-29) +885248*a(n-30) -749824*a(n-31) +744960*a(n-32) -1154048*a(n-33) +1763328*a(n-34) -1860608*a(n-35) +1447936*a(n-36) -688128*a(n-37) +45056*a(n-38) -90112*a(n-39) +385024*a(n-40) -655360*a(n-41) +655360*a(n-42) -163840*a(n-43) -65536*a(n-44) for n>50

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A254561 A254907 A257209 * A253841 A253935 A253834

Adjacent sequences:  A254897 A254898 A254899 * A254901 A254902 A254903

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 10 2015

STATUS

approved

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Last modified July 26 17:37 EDT 2021. Contains 346294 sequences. (Running on oeis4.)