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A257148 Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and column minus the sum of the minimums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1
2848, 16677, 101227, 594229, 3374539, 19028310, 106805258, 596053900, 3313202232, 18364278500, 101563966487, 560710638830, 3091513270239, 17027829457467, 93715212546183, 515462743205034, 2833901320808390 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A257154
LINKS
FORMULA
Empirical: a(n) = 9*a(n-1) -14*a(n-2) -32*a(n-3) +120*a(n-4) -1172*a(n-5) +3932*a(n-6) -6280*a(n-7) +19737*a(n-8) -12753*a(n-9) -31142*a(n-10) +10820*a(n-11) -324465*a(n-12) +244165*a(n-13) +487033*a(n-14) +676647*a(n-15) +2800415*a(n-16) -1508929*a(n-17) -11016270*a(n-18) -1321986*a(n-19) -19384745*a(n-20) +29741253*a(n-21) +65612097*a(n-22) +30108231*a(n-23) -132843037*a(n-24) +1221523*a(n-25) -217403908*a(n-26) +39811528*a(n-27) +1191428040*a(n-28) -1237901696*a(n-29) -725097232*a(n-30) +1861412656*a(n-31) -1356213568*a(n-32) +572751872*a(n-33) +971675648*a(n-34) -1887011840*a(n-35) +520824832*a(n-36) +413429760*a(n-37) -34947072*a(n-38) +44400640*a(n-39) -256638976*a(n-40) +222035968*a(n-41) -49283072*a(n-42) -88080384*a(n-43) +50331648*a(n-44) for n>50
EXAMPLE
Some solutions for n=3
..0..0..1..0....1..0..1..1....1..1..1..0....1..1..0..0....0..1..1..1
..1..0..0..1....0..0..0..0....1..0..0..0....0..1..1..1....0..0..0..0
..0..1..0..0....1..0..0..0....0..1..1..0....0..1..1..1....1..0..0..1
..0..0..0..1....1..1..1..1....1..0..0..1....1..1..1..0....0..1..1..0
..0..0..0..1....0..0..0..0....1..1..1..1....1..0..1..1....0..1..1..0
CROSSREFS
Sequence in context: A317472 A317473 A257155 * A254737 A234416 A218597
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 16 2015
STATUS
approved

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Last modified March 29 10:44 EDT 2024. Contains 371268 sequences. (Running on oeis4.)