# A000840 (b-file synthesized from sequence entry) 1 0 2 0 3 1 4 1 5 2 6 5 7 12 8 31 9 90 10 285 11 938 12 3285 13 11983 14 45390 15 177803 16 718390 17 2986407 18 12749364 19 55802982 20 250068732 21 1145923828 22 5363795830 23 25620207380 24 124767647097 25 618983876918 26 3126035142910 27 16060182735947 28 83883575376862 29 445164927249466 30 2399098651337048