# A141288 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 12 5 84 6 252 7 252 8 504 9 2520 10 17640 11 52920 12 52920 13 52920 14 52920 15 476280 16 952560 17 952560 18 4762800 19 61916400 20 185749200 21 928746000 22 928746000 23 928746000 24 928746000 25 4643730000 26 13931190000 27 13931190000 28 13931190000 29 13931190000