# A096979 (b-file synthesized from sequence entry) 0 0 1 1 2 6 3 36 4 210 5 1225 6 7140 7 41616 8 242556 9 1413721 10 8239770 11 48024900 12 279909630 13 1631432881 14 9508687656 15 55420693056 16 323015470680 17 1882672131025 18 10973017315470 19 63955431761796 20 372759573255306 21 2172602007770041