A222681 - OEIS

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A222681 as a simple table

n	a(n)
1	5
2	5
3	11
4	58
5	142
6	2398
7	6463
8	146947
9	401552
10	9871237
11	27759999
12	675112590
13	1962193874
14	46428879519
15	139050595341
16	3201678397354
17	9862902257940
18	221229238222335
19	700012077054917

[5,5,11,58,142,2398,6463,146947,401552,9871237, 27759999,675112590,1962193874,46428879519, 139050595341,3201678397354,9862902257940, 221229238222335,700012077054917]