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 A254263 Number of (4+2)X(n+2) 0..1 arrays with every 3X3 subblock sum of the two maximums of the diagonal and antidiagonal minus the sum of the minimums of the central row and column nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1
 54236, 223357, 718226, 2983064, 12249828, 49369118, 197326142, 771607126, 2988561988, 11447620204, 43838201036, 167053149544, 637238685986, 2430896471842, 9321842851660, 35838046262150, 138903129042950 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 4 of A254260 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 6*a(n-1) +26*a(n-2) -146*a(n-3) -455*a(n-4) +1154*a(n-5) +6767*a(n-6) -2920*a(n-7) -42605*a(n-8) -35406*a(n-9) +58183*a(n-10) -151832*a(n-11) +683871*a(n-12) +6499614*a(n-13) +4735393*a(n-14) -51112984*a(n-15) -114140326*a(n-16) +136292264*a(n-17) +742062187*a(n-18) +366233074*a(n-19) -2329427252*a(n-20) -3608482848*a(n-21) +2542915684*a(n-22) +10811253048*a(n-23) +4756583856*a(n-24) -13607504608*a(n-25) -16300351552*a(n-26) -3936912896*a(n-27) +13639591168*a(n-28) +27310157824*a(n-29) +12147660800*a(n-30) -23610398720*a(n-31) -27889451008*a(n-32) -1292050432*a(n-33) +10694885376*a(n-34) +14263123968*a(n-35) +8161329152*a(n-36) -7736918016*a(n-37) -9831972864*a(n-38) +2157969408*a(n-39) +3774873600*a(n-40) -1207959552*a(n-41) for n>50 EXAMPLE Some solutions for n=1 ..0..1..0....1..0..1....1..0..1....0..1..0....0..0..0....0..1..0....0..0..0 ..1..1..1....0..1..1....1..1..1....1..1..0....1..1..1....1..0..0....0..0..1 ..0..1..1....1..1..0....1..0..1....1..1..0....0..0..1....0..1..1....1..0..0 ..0..1..0....1..0..1....0..0..0....0..1..1....1..0..0....1..0..0....0..1..0 ..1..1..0....1..0..0....0..1..1....0..1..0....0..1..1....0..0..1....0..0..0 ..1..0..0....1..1..1....1..0..0....0..0..1....0..1..0....1..1..0....1..0..1 CROSSREFS Sequence in context: A224617 A224625 A224618 * A254256 A254302 A202315 Adjacent sequences: A254260 A254261 A254262 * A254264 A254265 A254266 KEYWORD nonn AUTHOR R. H. Hardin, Jan 27 2015 STATUS approved

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Last modified September 7 13:22 EDT 2024. Contains 375730 sequences. (Running on oeis4.)