# A153391 (b-file synthesized from sequence entry)
0 1
1 1
2 5
3 29
4 183
5 1223
6 8525
7 61366
8 453003
9 3412077
10 26124599
11 202748728
12 1591450129
13 12612760009
14 100790253764
15 811227147197
16 6570431009209
17 53512143110041
18 437976298197769
19 3600504527707557
20 29716593448484673