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 A207297 Number of (n+1)X4 0..3 arrays with rows and columns of determinants of all 2X2 subblocks lexicographically nondecreasing 1
 15040, 2019514, 158967751, 8967460486, 380160979265, 12920283700575, 373780805511860, 9750412079156987, 241430247391621937, 5901330382868059064, 145523611667737349951, 3643493262426579273152, 92443587623539722540173 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A207300 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 72*a(n-1) -1686*a(n-2) +5072*a(n-3) +401103*a(n-4) -6241272*a(n-5) +15657512*a(n-6) +403835904*a(n-7) -3944527488*a(n-8) +8453431296*a(n-9) +64599109632*a(n-10) -475519942656*a(n-11) +1287747403776*a(n-12) -1583479259136*a(n-13) +701730127872*a(n-14) for n>46 EXAMPLE Some solutions for n=4 ..0..2..3..1....3..1..3..1....2..0..3..3....1..0..1..1....3..3..0..3 ..1..2..2..3....2..0..1..3....0..0..3..3....2..0..3..3....2..1..0..3 ..0..0..0..0....3..2..3..1....2..0..0..0....1..0..3..3....1..0..0..1 ..2..2..3..0....2..3..2..1....1..0..0..2....3..0..1..1....2..2..0..0 ..2..2..3..0....0..3..1..2....2..0..0..2....0..0..0..3....0..3..0..0 CROSSREFS Sequence in context: A147578 A285993 A205022 * A151595 A254581 A254588 Adjacent sequences:  A207294 A207295 A207296 * A207298 A207299 A207300 KEYWORD nonn AUTHOR R. H. Hardin Feb 16 2012 STATUS approved

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