A112916 - OEIS

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A112916 as a simple table

n	a(n)
0	1
1	2
2	7
3	34
4	207
5	1496
6	12420
7	115938
8	1198831
9	13582010
10	167187547
11	2221174504
12	31675372612
13	482628099144
14	7825665501852
15	134562607924194
16	2446051941152127
17	46873289933397206
18	944492559814284397

[1,2,7,34,207,1496,12420,115938,1198831,13582010, 167187547,2221174504,31675372612,482628099144, 7825665501852,134562607924194,2446051941152127, 46873289933397206,944492559814284397]