# A020724 (b-file synthesized from sequence entry) 0 1 1 27 2 495 3 7695 4 109431 5 1474767 6 19198215 7 244167615 8 3055792311 9 37811613807 10 464078786535 11 5662363023135 12 68791291322391 13 833094971965647 14 10065613312624455 15 121404092777808255 16 1462402531680439671