# A129683 (b-file synthesized from sequence entry)
0 1
1 4
2 28
3 272
4 3344
5 49472
6 852928
7 16758016
8 369082624
9 8996922368
10 240294124544
11 6974172532736
12 218457925292032
13 7342688736329728
14 263513011737051136
15 10054112734940561408
16 406301504472849907712
17 17333090863574658842624
18 778298003006760943353856