Number of {2-1-3, 2'^e-31}-avoiding permutations of size n (see definition in the Elizalde paper).
A143017
Number of {2-1-3, 2'^e-31}-avoiding permutations of size n (see definition in the Elizalde paper).
Terms
- a(0) =1a(1) =2a(2) =4a(3) =9a(4) =22a(5) =56a(6) =147a(7) =396a(8) =1088a(9) =3036a(10) =8582a(11) =24524a(12) =70727a(13) =205594a(14) =601756a(15) =1771937a(16) =5245544a(17) =15602496a(18) =46606356a(19) =139753120a(20) =420520000a(21) =1269361000a(22) =3842722454a(23) =11663928644a(24) =35490451807a(25) =108232655126a(26) =330760284892
External references
- oeis: A143017