# A151460 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 12 4 44 5 164 6 643 7 2574 8 10554 9 43956 10 185642 11 792846 12 3418616 13 14860606 14 65054182 15 286536007 16 1268905654 17 5646284864 18 25232338903 19 113194654758 20 509574041184 21 2301247205497 22 10422542804458 23 47329681905633 24 215452103352557 25 982977683341317 26 4494071645187763 27 20586153075994492