# A017645 (b-file synthesized from sequence entry) 0 100000 1 5153632 2 45435424 3 205962976 4 656356768 5 1680700000 6 3707398432 7 7339040224 8 13382255776 9 22877577568 10 37129300000 11 57735339232 12 86617093024 13 126049300576 14 178689902368 15 247609900000