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 A240456 Number of nX2 0..3 arrays with no element equal to one plus the sum of elements to its left or three plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4 1
 4, 21, 102, 476, 2200, 10123, 46471, 213000, 975380, 4464474, 20429739, 93474260, 427645941, 1956395954, 8949898045, 40942368765, 187294120155, 856787747966, 3919414321141, 17929510264717, 82019155503670, 375199231601451 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A240460 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 8*a(n-1) -20*a(n-2) +34*a(n-3) -84*a(n-4) +92*a(n-5) -68*a(n-6) +222*a(n-7) +13*a(n-8) -251*a(n-9) +25*a(n-10) -495*a(n-11) +485*a(n-12) -44*a(n-13) -180*a(n-14) +554*a(n-15) -648*a(n-16) +14*a(n-17) +152*a(n-18) -190*a(n-19) -140*a(n-20) +397*a(n-21) -273*a(n-22) +75*a(n-23) +167*a(n-24) -136*a(n-25) +27*a(n-26) EXAMPLE Some solutions for n=4 ..2..0....2..0....0..2....2..2....0..0....2..2....2..2....2..0....0..2....2..2 ..0..2....0..0....2..0....2..2....2..2....0..0....2..2....3..2....2..2....3..2 ..3..3....0..0....3..2....2..0....3..2....2..2....0..2....2..2....2..0....3..2 ..3..1....2..2....3..1....2..2....3..2....0..2....0..3....0..0....2..0....2..2 CROSSREFS Sequence in context: A292308 A076901 A080043 * A113022 A291184 A014986 Adjacent sequences: A240453 A240454 A240455 * A240457 A240458 A240459 KEYWORD nonn AUTHOR R. H. Hardin, Apr 05 2014 STATUS approved

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Last modified September 18 13:18 EDT 2024. Contains 376000 sequences. (Running on oeis4.)