A237399 - OEIS

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A237399 as a simple table

n	a(n)
1	256
2	1540
3	9296
4	58088
5	363220
6	2273712
7	14242608
8	89287168
9	559586448
10	3506120448
11	21975379072
12	137776906368
13	863524228864
14	5410642304512
15	33913297265408
16	212624965143552
17	1332643818862080
18	8350065823585280

[256,1540,9296,58088,363220,2273712,14242608, 89287168,559586448,3506120448,21975379072, 137776906368,863524228864,5410642304512, 33913297265408,212624965143552,1332643818862080, 8350065823585280]