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 A099945 Number of 4 X n binary matrices avoiding simultaneously the right angled numbered polyomino patterns (ranpp) (00;1) and (11;0). 0
 188, 404, 836, 1700, 3428, 6884, 13796, 27620, 55268, 110564, 221156, 442340, 884708, 1769444, 3538916, 7077860, 14155748, 28311524, 56623076, 113246180, 226492388, 452984804, 905969636, 1811939300, 3623878628, 7247757284 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,1 COMMENTS An occurrence of a ranpp (xy;z) in a matrix A=(a(i,j)) is a triple (a(i1,j1), a(i1,j2), a(i2,j1)) where i10 and n>2; for n=2 the number is (m+1)*2^m. LINKS S. Kitaev, On multi-avoidance of right angled numbered polyomino patterns, Integers: Electronic Journal of Combinatorial Number Theory 4 (2004), A21, 20pp. Index entries for linear recurrences with constant coefficients, signature (3, -2). FORMULA a(n) = 27*2^n-28. PROG (PARI) vector(50, n, i=n+2; 27*2^i-28) \\ Michel Marcus, Dec 01 2014 CROSSREFS Cf. A000105. Sequence in context: A186397 A260836 A304279 * A211814 A233786 A233961 Adjacent sequences:  A099942 A099943 A099944 * A099946 A099947 A099948 KEYWORD nonn AUTHOR Sergey Kitaev, Nov 12 2004 STATUS approved

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Last modified October 15 15:14 EDT 2019. Contains 328030 sequences. (Running on oeis4.)