A069215 - OEIS

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A069215 as a simple table

n	a(n)
1	1
2	21
3	63
4	270
5	291
6	2991
7	6102
8	46676013
9	69460293
10	2346534651
11	6313047393
12	23400000651
13	80050617822
14	234065340651
15	234659934651
16	2340000000651
17	2530227348360
18	2934000006591

[1,21,63,270,291,2991,6102,46676013,69460293, 2346534651,6313047393,23400000651,80050617822, 234065340651,234659934651,2340000000651, 2530227348360,2934000006591]