# A266091 (b-file synthesized from sequence entry) 0 1 1 3 2 15 3 126 4 1782 5 42471 6 1706562 7 115640460 8 13216815036 9 2548124192970 10 828751754742975 11 454739496669274500 12 420972227408592675000 13 657522745057190417409000 14 1732789066323343611643088400 15 7704900186426840030325195822560 16 57807195523790513335568376591463776