# A028006 (b-file synthesized from sequence entry)
0 1
1 27
2 473
3 6831
4 88473
5 1069551
6 12338761
7 137686527
8 1499327225
9 16029462735
10 168979616169
11 1762044328863
12 18217806426457
13 187092613978479
14 1911192049791497
15 19440694364069439
16 197083660672701369
17 1992576025702599183
18 20101955387867645545