# A035609 (b-file synthesized from sequence entry) 0 1 1 40 2 800 3 10680 4 107200 5 864008 6 5831520 7 33940120 8 174074240 9 800061160 10 3340552608 11 12819218040 12 45663942720 13 152270990280 14 478683156960 15 1426865410392 16 4052167914240 17 11006991835560 18 28691971995680 19 71976895917880