# A309117 (b-file synthesized from sequence entry) 0 1 1 1 2 5 3 15 4 56 5 203 6 749 7 2777 8 10293 9 38240 10 141997 11 527593 12 1960029 13 7282483 14 27057400 15 100531559 16 373522965 17 1387822193 18 5156442953 19 19158736256 20 71184183353 21 264484479633 22 982690786037 23 3651182836279 24 13565952140920 25 50404229548515 26 187276671274621