# A052826 (b-file synthesized from sequence entry)
0 0
1 0
2 2
3 9
4 48
5 315
6 2497
7 23394
8 254132
9 3149826
10 43945354
11 682314028
12 11676044036
13 218402171520
14 4433885571840
15 97098961376112
16 2281563329170752
17 57255174735315792
18 1528204674443305680
19 43227315891291907488
20 1291646719998952196448
21 40652195494651491747840