# A166897 (b-file synthesized from sequence entry) 1 1 2 3 3 13 4 39 5 126 6 477 7 1765 8 6495 9 24709 10 95128 11 367368 12 1431453 13 5620343 14 22170543 15 87858813 16 349708431 17 1397003136 18 5598513261 19 22502171771 20 90681323364 21 366299212873 22 1482827487650 23 6014529069540 24 24439715146941