# A354311 (b-file synthesized from sequence entry) 0 1 1 0 2 2 3 6 4 28 5 160 6 1056 7 7784 8 63568 9 569664 10 5542240 11 58038112 12 650045760 13 7746901760 14 97790608384 15 1302349549440 16 18235836899584 17 267663541270528 18 4107395264113152 19 65739857693144576 20 1095095457262013440 21 18949711553467957248 22 340036076121127395328