# A144144 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 12 5 75 6 108 7 315 8 184 9 2205 10 2680 11 4840 12 5304 13 10712 14 9912 15 23160 16 39664 17 725968 18 1005840 19 4497072 20 4502480 21 18009936 22 18074320 23 143972272 24 144087792 25 145697200 26 145945904 27 295085808 28 296316720 29 592629616 30 590310000 31 1180428912