# A035354 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 2 4 4 5 11 6 33 7 103 8 330 9 1077 10 3556 11 11895 12 40187 13 137049 14 471070 15 1630819 16 5680854 17 19899698 18 70053093 19 247711242 20 879441789 21 3133648932 22 11202930544 23 40172365842 24 144453506494 25 520759972064 26 1881787195944 27 6814766134276