# A131203 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 9 4 28 5 93 6 315 7 1091 8 3855 9 13797 10 49929 11 182361 12 671088 13 2485504 14 9256395 15 34636833 16 130150493 17 490853403 18 1857283155 19 7048151355 20 26817356775 21 102280151421 22 390937467284 23 1497207322929 24 5744387279808 25 22076468760335