# A122020 (b-file synthesized from sequence entry) 1 1 2 6 3 66 4 1140 5 28280 6 948570 7 41173776 8 2238150600 9 148570107264 10 11804909261310 11 1104566746764800 12 120062928157552380 13 14986973664751315968 14 2127288759957421124610 15 340440417300990616995840