# A137645 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 4
4 42
5 608
6 10986
7 240492
8 6167112
9 181154848
10 5995624710
11 220711502648
12 8943846698096
13 395588177834784
14 18962600075658460
15 979198125493716492
16 54189002212286942316
17 3199366560075461850320
18 200730550064907653703510