# A120896 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 10 5 27 6 73 7 189 8 518 9 1413 10 3857 11 10707 12 29804 13 83365 14 234665 15 662654 16 1878059 17 5341302 18 15231940 19 43552610 20 124829236 21 358537455 22 1031835260 23 2974872009 24 8590929683 25 24847042484 26 71964879243 27 208704926659