A376918 - OEIS

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A376918 as a simple table

n	a(n)
1	1
2	2
3	4
4	11
5	51
6	177
7	876
8	3965
9	20782
10	114462
11	678568
12	4160919
13	27640938
14	190402900
15	1378295071
16	10437144322
17	82285618466
18	671415306221
19	5676395537455

[1,2,4,11,51,177,876,3965,20782,114462,678568, 4160919,27640938,190402900,1378295071,10437144322, 82285618466,671415306221,5676395537455]