# A163104 (b-file synthesized from sequence entry)
0 1
1 18
2 306
3 5202
4 88281
5 1498176
6 25424928
7 431474688
8 7322358456
9 124264377216
10 2108833575552
11 35788044422016
12 607342437246528
13 10306929088604160
14 174914151758088192
15 2968387598501627904
16 50375140298107596288
17 854893330417826832384
18 14508001408391876911104