A143740 - OEIS

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A143740 as a simple table

n	a(n)
0	1
1	1
2	2
3	7
4	34
5	216
6	1696
7	15898
8	173468
9	2161036
10	30282076
11	471599316
12	8082816160
13	151218316120
14	3066890630168
15	67031194526416
16	1570793031033616
17	39290173530686544
18	1044871388684004304
19	29440090627527552976

[1,1,2,7,34,216,1696,15898,173468,2161036, 30282076,471599316,8082816160,151218316120, 3066890630168,67031194526416,1570793031033616, 39290173530686544,1044871388684004304, 29440090627527552976]