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 A116485 Number of permutations in S_n that avoid the pattern 12453 (or equivalently, 31245). 18
 1, 1, 2, 6, 24, 119, 694, 4581, 33286, 260927, 2174398, 19053058, 174094868, 1648198050, 16085475576, 161174636600, 1652590573612, 17292601075489, 184246699159418, 1995064785620557, 21919480341617102, 244015986016996763, 2749174129340156922, 31313478171012371344 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Yonah Biers-Ariel, Table of n, a(n) for n = 0..37 Yonah Biers-Ariel, Julia program to compute terms Zvezdelina Stankova-Frenkel and Julian West, A new class of Wilf-equivalent permutations, arXiv:math/0103152 [math.CO], 2001. FORMULA Conjecture: a(n) + A158423(n) = n!. - Benedict W. J. Irwin, Mar 15 2016 The conjecture is true: All that is needed is to show that 23145 is Wilf-equivalent to 31245, but thatâ€™s obvious since they are inverses. - Doron Zeilberger and Yonah Biers-Ariel, Feb 26 2019 CROSSREFS Representatives for the 16 Wilf-equivalence patterns of length 5 are given in A116485, A047889, and A256195-A256208. - N. J. A. Sloane, Mar 19 2015 Cf. A099952, A158423. Sequence in context: A256203 A256204 A256205 * A256206 A052397 A047889 Adjacent sequences:  A116482 A116483 A116484 * A116486 A116487 A116488 KEYWORD nonn AUTHOR Zvezdelina Stankova (stankova(AT)mills.edu), Mar 19 2006 EXTENSIONS More terms from the Zvezdelina Stankova-Frenkel and Julian West paper. - N. J. A. Sloane, Mar 19 2015 More terms from Doron Zeilberger and Yonah Biers-Ariel, Feb 26 2019 More terms from Yonah Biers-Ariel, Mar 04 2019 STATUS approved

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Last modified June 25 10:10 EDT 2019. Contains 324351 sequences. (Running on oeis4.)