# A148055 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 3 4 10 5 20 6 68 7 147 8 558 9 1308 10 4840 11 11638 12 45142 13 112918 14 431806 15 1095775 16 4299562 17 11168048 18 43431360 19 113876158 20 449752342 21 1197311782 22 4700292130 23 12596627212 24 49945553674 25 135283990390 26 534123243068 27 1454033588472 28 5779639647718 29 15857393541418 30 62837646837160 31 173088744641491