# A019231 (b-file synthesized from sequence entry) 3 0 4 1 5 2 6 4 7 8 8 18 9 40 10 98 11 220 12 533 13 1374 14 3123 15 7891 16 20758 17 51623 18 134426 19 350099 20 896154 21 2334491 22 6080296 23 15820903 24 41484494 25 108963192 26 286929392 27 758672816 28 2009479756 29 5336446323 30 14205462811 31 37882139049