# A002170 (b-file synthesized from sequence entry) 1 6 2 48 3 528 4 7920 5 149856 6 3169248 7 77046528 8 2231209728 9 71938507776 10 2446325534208 11 92886269386752 12 3995799894239232 13 180512165153832960 14 8443006907441565696 15 440473891771339603968 16 25125124946211876962304 17 1444211070518302580146176