Number of 1342-avoiding even Grassmannian permutations of size n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =5a(5) =12a(6) =17a(7) =32a(8) =41a(9) =67a(10) =81a(11) =121a(12) =141a(13) =198a(14) =225a(15) =302a(16) =337a(17) =437a(18) =481a(19) =607a(20) =661a(21) =816a(22) =881a(23) =1068a(24) =1145a(25) =1367a(26) =1457a(27) =1717a(28) =1821a(29) =2122