# A152394 (b-file synthesized from sequence entry)
0 1
1 3
2 8
3 40
4 216
5 1386
6 9552
7 71820
8 571440
9 4815778
10 42465144
11 391058720
12 3738272328
13 37015339410
14 378307524768
15 3983307781956
16 43109512918560
17 478808036794306
18 5448659044584680
19 63446989372749528
20 755057167559816440