# A027315 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 20 4 90 5 692 6 5774 7 48924 8 417440 9 3580036 10 30831756 11 266463804 12 2309848194 13 20074999500 14 174867895438 15 1526259877412 16 13344806416950 17 116863477094660 18 1024844657752730 19 8998915251701628 20 79108591391227406 21 696167664755023388 22 6132277201334483178