# A149653 (b-file synthesized from sequence entry) 0 1 1 1 2 5 3 15 4 75 5 259 6 1295 7 4865 8 24325 9 96141 10 480705 11 1963005 12 9815025 13 40997637 14 204988185 15 870599775 16 4352998875 17 18725337979 18 93626689895 19 406867433759 20 2034337168795 21 8914047523335 22 44570237616675 23 196649902923155 24 983249514615775 25 4363658368502347 26 21818291842511735 27 97316882885983575