# A084857 (b-file synthesized from sequence entry) 0 0 1 1 2 10 3 48 4 176 5 560 6 1632 7 4480 8 11776 9 29952 10 74240 11 180224 12 430080 13 1011712 14 2351104 15 5406720 16 12320768 17 27852800 18 62521344 19 139460608 20 309329920 21 682622976 22 1499463680 23 3279945728 24 7147094016 25 15518924800 26 33587986432