A020968 - OEIS

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A020968 as a simple table

n	a(n)
0	1
1	26
2	455
3	6700
4	89661
5	1130766
6	13712035
7	161844800
8	1874156921
9	21406992706
10	242089527615
11	2717862993300
12	30349359729781
13	337562780465846
14	3743627395703195
15	41428143398876200
16	457728746687336241

[1,26,455,6700,89661,1130766,13712035,161844800, 1874156921,21406992706,242089527615,2717862993300, 30349359729781,337562780465846,3743627395703195, 41428143398876200,457728746687336241]