# A006494 (b-file synthesized from sequence entry)
0 1
1 20
2 400
3 8902
4 197281
5 4865617
6 119060679
7 3195913043
8 84999425906
9 2439540533153
10 69353270203366
11 2097660204806910
12 62855340727822758
13 1981075507583376209