# A087074 (b-file synthesized from sequence entry) 1 1 2 1 3 1 4 1 5 2 6 3 7 3 8 1 9 3 10 12 11 66 12 378 13 1890 14 7560 15 22680 16 45360 17 45360 18 1 19 3 20 33 21 426 22 5466 23 65520 24 720720 25 7207200 26 64864800 27 518918400 28 3632428800 29 21794572800 30 108972864000 31 435891456000 32 1307674368000 33 2615348736000 34 2615348736000 35 1