# A307468 (b-file synthesized from sequence entry) 0 1 1 4 2 28 3 232 4 2156 5 21944 6 240280 7 2787320 8 33820044 9 424925872 10 5486681368 11 72398776344 12 972270849512 13 13247921422480 14 182729003683352 15 2546778437385032 16 35816909974343308 17 507700854900783784 18 7246857513425470288 19 104083322583897779656