# A251574 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 40 4 712 5 18784 6 663424 7 29480896 8 1581976960 9 99585422848 10 7198258087936 11 587699970912256 12 53497834761985024 13 5372784803063664640 14 590164397145095421952 15 70386834555048578596864 16 9058611906733586004803584 17 1251310862246447324484468736 18 184665445630564847038730076160