# A218216 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 15 4 65 5 175 6 1155 7 7229 8 31081 9 162755 10 1018195 11 5448645 12 28879019 13 171229541 14 991796825 15 5540516759 16 32232757569 17 190448140543 18 1105001828111 19 6463178610505 20 38380301015595 21 227218808375165 22 1344777832158545 23 8022879439995215 24 47988823484272835