# A181320 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 2 4 7 5 5 6 6 7 48 8 91 9 49 10 24 11 360 12 1304 13 1697 14 729 15 120 16 3000 17 17910 18 41440 19 41051 20 14641 21 720 22 27720 23 249900 24 899730 25 1524282 26 1218745 27 371293