# A037794 (b-file synthesized from sequence entry) 1 3 2 17 3 86 4 430 5 2153 6 10767 7 53836 8 269180 9 1345903 10 6729517 11 33647586 12 168237930 13 841189653 14 4205948267 15 21029741336 16 105148706680 17 525743533403 18 2628717667017 19 13143588335086 20 65717941675430 21 328589708377153