# A007876 (b-file synthesized from sequence entry) 1 1 2 2 3 4 4 9 5 27 6 82 7 328 8 1313 9 6565 10 32826 11 196956 12 1181737 13 8272159 14 57905114 15 463240912 16 3705927297 17 33353345673 18 300180111058 19 3001801110580 20 30018011105801 21 330198122163811 22 3632179343801922 23 43586152125623064