# A099214 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 12 4 40 5 128 6 400 7 1248 8 3904 9 12224 10 38272 11 119808 12 375040 13 1174016 14 3675136 15 11504640 16 36014080 17 112738304 18 352915456 19 1104764928 20 3458351104 21 10826006528 22 33889681408 23 106088103936 24 332097716224 25 1039597174784