# A136574 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 7 4 30 5 149 6 868 7 5907 8 46226 9 409105 10 4037904 11 43954703 12 522956302 13 6749977101 14 93928268300 15 1401602636299 16 22324392524298 17 378011820620297 18 6780385526348296 19 128425485935180295 20 2561327494111820294