A108082 - OEIS

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A108082 as a simple table

n	a(n)
0	1
1	4
2	26
3	176
4	1204
5	8273
6	56967
7	392688
8	2708322
9	18683233
10	128892764
11	889172365
12	6133354976
13	42300883471
14	291696384929
15	2011120962840
16	13863370486596
17	95548230542403
18	658416136868846
19	4536321401562529

[1,4,26,176,1204,8273,56967,392688,2708322, 18683233,128892764,889172365,6133354976, 42300883471,291696384929,2011120962840, 13863370486596,95548230542403,658416136868846, 4536321401562529]