A169228 - OEIS

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A169228 as a simple table

n	a(n)
0	1
1	23
2	506
3	11132
4	244904
5	5387888
6	118533536
7	2607737792
8	57370231424
9	1262145091328
10	27767192009216
11	610878224202752
12	13439320932460544
13	295665060514131968
14	6504631331310903296
15	143101889288839872512

[1,23,506,11132,244904,5387888,118533536, 2607737792,57370231424,1262145091328, 27767192009216,610878224202752,13439320932460544, 295665060514131968,6504631331310903296, 143101889288839872512]