# A049183 (b-file synthesized from sequence entry) 1 1 2 1 3 3 4 11 5 45 6 195 7 885 8 4151 9 19963 10 97899 11 487717 12 2461393 13 12557439 14 64657461 15 335562499 16 1753538133 17 9218852525 18 48725353661 19 258759350495 20 1380021781719 21 7388261669161 22 39692491630271 23 213918652593929