A028227 - OEIS

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A028227 as a simple table

n	a(n)
0	1
1	39
2	958
3	18966
4	330883
5	5313693
6	80518096
7	1169149692
8	16435587685
9	225292911987
10	3026941267714
11	40015278899778
12	522017655765607
13	6735488552529321
14	86110477932406612
15	1092366397140622824

[1,39,958,18966,330883,5313693,80518096, 1169149692,16435587685,225292911987,3026941267714, 40015278899778,522017655765607,6735488552529321, 86110477932406612,1092366397140622824]