# A147372 (b-file synthesized from sequence entry) 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 4 10 7 11 14 12 21 13 40 14 79 15 252 16 611 17 2359 18 6199 19 23158 20 70484 21 325136 22 1222235 23 6869095 24 29506240 25 189032773 26 936666179