# A000765 (b-file synthesized from sequence entry)
0 1
1 4
2 36
3 308
4 2764
5 25404
6 237164
7 2237948
8 21286548
9 203701772
10 1958748676
11 18908954324
12 183135542956
13 1778581016076
14 17314029758828
15 168891863875652