A017930 - OEIS

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A017930 as a simple table

n	a(n)
0	1
1	3
2	8
3	23
4	64
5	182
6	512
7	1449
8	4096
9	11586
10	32768
11	92682
12	262144
13	741456
14	2097152
15	5931642
16	16777216
17	47453133
18	134217728
19	379625063
20	1073741824
21	3037000500
22	8589934592
23	24296004000
24	68719476736

[1,3,8,23,64,182,512,1449,4096,11586,32768,92682, 262144,741456,2097152,5931642,16777216,47453133, 134217728,379625063,1073741824,3037000500, 8589934592,24296004000,68719476736]