A107882 - OEIS

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A107882 as a simple table

n	a(n)
0	1
1	2
2	5
3	19
4	104
5	766
6	7197
7	82910
8	1136923
9	18141867
10	330940109
11	6803936050
12	155839142185
13	3938383850350
14	108934529005948
15	3275059508166297
16	106388204134734785
17	3714826559490125850
18	138796913898027894261

[1,2,5,19,104,766,7197,82910,1136923,18141867, 330940109,6803936050,155839142185,3938383850350, 108934529005948,3275059508166297, 106388204134734785,3714826559490125850, 138796913898027894261]