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 A208318 Number of n X 4 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors. 1
 14, 982, 71956, 5269968, 385979024, 28269518640, 2070490270512, 151644956050096, 11106641282635568, 813462470412951472, 59578874831184784432, 4363621500998057092272, 319596378043822928054576 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A208322. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 65*a(n-1) + 600*a(n-2) + 320*a(n-3) - 4224*a(n-4) + 1728*a(n-5) for n>6. Empirical g.f.: 2*x*(7 + 36*x - 137*x^2 - 426*x^3 + 1200*x^4 - 432*x^5) / (1 - 65*x - 600*x^2 - 320*x^3 + 4224*x^4 - 1728*x^5). - Colin Barker, Jul 02 2018 EXAMPLE Some solutions for n=4: ..0..1..1..0....0..0..0..1....0..0..0..1....0..0..0..0....0..0..0..0 ..1..2..1..2....2..0..1..0....1..1..1..0....1..0..1..0....0..1..1..0 ..0..1..2..1....0..2..1..1....0..1..2..2....2..2..1..2....0..1..0..2 ..2..0..0..1....2..0..0..1....0..0..0..2....0..0..2..0....2..2..0..1 CROSSREFS Cf. A208322. Sequence in context: A064729 A189304 A123178 * A349737 A263217 A208388 Adjacent sequences:  A208315 A208316 A208317 * A208319 A208320 A208321 KEYWORD nonn AUTHOR R. H. Hardin, Feb 25 2012 STATUS approved

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Last modified January 22 02:46 EST 2022. Contains 350481 sequences. (Running on oeis4.)