# A148401 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 17 5 49 6 175 7 574 8 2215 9 7794 10 31002 11 114827 12 469571 13 1802223 14 7507304 15 29616634 16 125224110 17 504660980 18 2158999665 19 8852141829 20 38237746911 21 159011512866 22 692421182858 23 2913714414087 24 12774870975808 25 54299529666488 26 239474510946361 27 1026713175859252 28 4551287121301993