A020971 - OEIS

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A020971 as a simple table

n	a(n)
0	1
1	27
2	490
3	7470
4	103291
5	1343097
6	16753780
7	202932540
8	2405791381
9	28065859767
10	323426323870
11	3691983687210
12	41834308968271
13	471276683342037
14	5284615302054760
15	59040661951743480
16	657669557062017961

[1,27,490,7470,103291,1343097,16753780,202932540, 2405791381,28065859767,323426323870,3691983687210, 41834308968271,471276683342037,5284615302054760, 59040661951743480,657669557062017961]