# A127055 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 9 4 25 5 89 6 403 7 2246 8 14887 9 114239 10 994909 11 9687123 12 104223700 13 1227484193 14 15703071262 15 216798771109 16 3212441188268 17 50845473960657 18 856063393693256 19 15276025334127835 20 287977916632275512