# A047109 (b-file synthesized from sequence entry) 0 1 1 1 2 5 3 31 4 151 5 917 6 5619 7 33627 8 210911 9 1326395 10 8366161 11 53441835 12 342477957 13 2203613164 14 14248253995 15 92379163952 16 600644552471 17 3915699367751 18 25579440322831 19 167423682425912 20 1097738520430457 21 7208383257398805