Number of 123-avoiding stabilized-interval-free permutations of size n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =14a(6) =44a(7) =150a(8) =496a(9) =1758a(10) =6018a(11) =21782a(12) =76414a(13) =280448a(14) =1001752a(15) =3714032a(16) =13450270a(17) =50259604a(18) =183995056a(19) =691863078a(20) =2555043320a(21) =9657267848a(22) =35921300392a(23) =136360740016a(24) =510267869416