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 A301994 Number of n X 3 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
 1, 2, 5, 15, 48, 155, 499, 1602, 5137, 16467, 52784, 169199, 542375, 1738618, 5573261, 17865479, 57269040, 183579891, 588478091, 1886407378, 6047009817, 19384109803, 62137109808, 199184819687, 638500768991, 2046758546378, 6561026627701 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 3 of A301999. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 5*a(n-1) - 7*a(n-2) + 4*a(n-3). Empirical: partial sums of A049219. - Sean A. Irvine, Jul 13 2022 EXAMPLE Some solutions for n=5: 0 0 0 0 0 1 0 0 1 0 0 1 0 0 1 0 0 0 0 0 1 1 1 0 1 1 0 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 0 0 0 0 0 1 0 0 0 0 1 1 1 1 0 0 0 1 0 0 1 1 0 0 1 1 1 1 0 0 1 0 1 0 0 0 1 0 1 1 1 1 0 0 1 0 0 1 0 0 1 0 0 0 1 1 1 0 0 0 0 0 CROSSREFS Cf. A301999, A049219. Sequence in context: A149925 A149926 A321467 * A289589 A071739 A268407 Adjacent sequences: A301991 A301992 A301993 * A301995 A301996 A301997 KEYWORD nonn AUTHOR R. H. Hardin, Mar 30 2018 STATUS approved

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Last modified December 1 20:35 EST 2023. Contains 367502 sequences. (Running on oeis4.)