# A203007 (b-file synthesized from sequence entry) 1 1 2 3 3 11 4 61 5 518 6 6974 7 149574 8 5151036 9 285534660 10 25535107140 11 3687959921760 12 860864908848480 13 324911938205144160 14 198334214378751672000 15 195840008156732278248000 16 312839537789862069432264000