Number of permutations of length n which avoid the patterns 1432, 2314, 3241.

Terms

a(0) =1a(1) =2a(2) =6a(3) =21a(4) =72a(5) =232a(6) =712a(7) =2116a(8) =6155a(9) =17629a(10) =49893a(11) =139851a(12) =388899a(13) =1074280a(14) =2950885a(15) =8066698a(16) =21960083a(17) =59566264a(18) =161060160a(19) =434269077a(20) =1168017399a(21) =3134554480a(22) =8395344424a(23) =22445226508a(24) =59911148129a(25) =159681826564a(26) =425035944306