# A363115 (b-file synthesized from sequence entry) 0 0 1 1 2 1 3 4 4 22 5 168 6 1616 7 18800 8 256432 9 4012288 10 70825344 11 1392214272 12 30157260288 13 713680180224 14 18319344307200 15 506934586748928 16 15043324048398336 17 476540007615725568 18 16050059458251915264 19 572710950848334200832 20 21582629580640554123264 21 856552661738538476765184