# A230555 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 10 5 25 6 66 7 173 8 460 9 1218 10 3240 11 8602 12 22878 13 60794 14 161668 15 429752 16 1142758 17 3038173 18 8078606 19 21479469 20 57113888