# A143436 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 26
4 216
5 2091
6 22532
7 263302
8 3282572
9 43184125
10 594892016
11 8533187394
12 126911650416
13 1950679300314
14 30905935176876
15 503694878376602
16 8429969774716104
17 144679270141457684
18 2543281262706638148