A228851 - OEIS

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A228851 as a simple table

n	a(n)
1	5
2	23
3	157
4	839
5	3449
6	5939
7	13417
8	73951
9	453991
10	500471
11	6949309
12	8282063
13	26332367
14	30345169
15	259778821
16	272282191
17	438571597
18	859046141
19	1037917517
20	3321660649
21	398296179
22	12252989773

[5,23,157,839,3449,5939,13417,73951,453991,500471, 6949309,8282063,26332367,30345169,259778821, 272282191,438571597,859046141,1037917517, 3321660649,398296179,12252989773]