A017923 - OEIS

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A017923 as a simple table

n	a(n)
0	1
1	2
2	6
3	15
4	36
5	88
6	216
7	529
8	1296
9	3175
10	7776
11	19047
12	46656
13	114283
14	279936
15	685700
16	1679616
17	4114202
18	10077696
19	24685213
20	60466176
21	148111278
22	362797056
23	888667667
24	2176782336
25	5332006004
26	13060694016

[1,2,6,15,36,88,216,529,1296,3175,7776,19047, 46656,114283,279936,685700,1679616,4114202, 10077696,24685213,60466176,148111278,362797056, 888667667,2176782336,5332006004,13060694016]