# A155633 (b-file synthesized from sequence entry) 0 1 1 10 2 60 3 340 4 1920 5 10900 6 62280 7 358060 8 2070240 9 12030820 10 70231800 11 411625180 12 2420922960 13 14281397140 14 84467679720 15 500702562700 16 2973697798080 17 17689598897860 18 105374653934040 19 628433226338620