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 A240286 Number of 3Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest, modulo 4 1
 3, 19, 80, 570, 2574, 20764, 97348, 802835, 3797188, 31467286, 149131302, 1237084277, 5865347475, 48665192186, 230756350987, 1914691579848, 9079103009997, 75334276334445, 357222415759008, 2964076274068268 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 3 of A240284 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 63*a(n-2) -1109*a(n-4) +7143*a(n-6) -395*a(n-8) -201246*a(n-10) +762860*a(n-12) +347011*a(n-14) -7366154*a(n-16) +11744674*a(n-18) +3758987*a(n-20) +10095295*a(n-22) -126415852*a(n-24) +204390541*a(n-26) -65238786*a(n-28) -59211883*a(n-30) -114625640*a(n-32) +381020006*a(n-34) -342073760*a(n-36) +16725276*a(n-38) +181283664*a(n-40) -110895680*a(n-42) +16492080*a(n-44) +1175136*a(n-46) +390464*a(n-48) for n>51 EXAMPLE Some solutions for n=4 ..3..3..1..3....3..1..3..1....3..3..1..1....3..1..3..1....3..3..1..3 ..2..0..1..3....3..2..3..2....2..0..0..2....3..1..2..0....3..2..0..3 ..2..0..1..2....2..2..3..2....2..0..0..0....3..1..2..0....3..1..2..2 CROSSREFS Sequence in context: A241885 A061171 A293561 * A163431 A167242 A089621 Adjacent sequences:  A240283 A240284 A240285 * A240287 A240288 A240289 KEYWORD nonn AUTHOR R. H. Hardin, Apr 03 2014 STATUS approved

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Last modified November 30 22:59 EST 2021. Contains 349426 sequences. (Running on oeis4.)