# A069152 (b-file synthesized from sequence entry) 2 0 3 1 4 2 5 23 6 84 7 719 8 4976 9 40311 10 362780 11 3628799 12 39896064 13 479001599 14 6227020604 15 87178290975 16 1307674363904 17 20922789887999 18 355687427991024 19 6402373705727999 20 121645100408672000 21 2432902008176639559