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 A120346 Number of permutations avoiding 3142, 25314, 246135 and 362514. 0
 1, 2, 6, 23, 102, 492, 2498, 13130, 70800, 389446, 2176802, 12328552, 70597568, 408061604, 2377643974, 13950607135, 82355028006, 488797440712, 2915087969496, 17459865132260, 104981190319396, 633438776314456 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS These permutations are the wreath closure of 1, 12, 21 and 2413. LINKS R. Brignall, S. Huczynska and V. Vatter, Simple permutations and algebraic generating functions, arXiv:math.CO/0608391. FORMULA G.f. satisfies f^5+f^4+f^2+(x-1)f+x=0. EXAMPLE a(4)=23 because all permutations of length 4 except 3142 lies in this set. CROSSREFS Sequence in context: A263576 A231444 A248900 * A050389 A098746 A245389 Adjacent sequences:  A120343 A120344 A120345 * A120347 A120348 A120349 KEYWORD nonn AUTHOR Vincent Vatter, Aug 16 2006 STATUS approved

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Last modified May 17 22:15 EDT 2021. Contains 343992 sequences. (Running on oeis4.)