# A296789 (b-file synthesized from sequence entry) 0 1 1 2 2 20 3 504 4 24464 5 1959840 6 234852672 7 39370660224 8 8799246209280 9 2528787321598464 10 908585701684024320 11 399070678264750356480 12 210373049449102957645824 13 131083661069772517440921600 14 95304505860052894815543705600 15 79961055068441273887848131297280