# A149927 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 15 4 48 5 163 6 573 7 2093 8 7827 9 29830 10 115754 11 455939 12 1817086 13 7316796 14 29756708 15 122012669 16 503813023 17 2094285936 18 8759168442 19 36826653285 20 155577457016 21 660287621380 22 2813953261588 23 12036662291890 24 51668602454264 25 222532058296393 26 961307279118620 27 4164329282317083