A042446 - OEIS

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A042446 as a simple table

n	a(n)
0	27
1	55
2	137
3	1151
4	1288
5	3727
6	5015
7	18772
8	98875
9	117647
10	569463
11	687110
12	1256573
13	1943683
14	7087622
15	9031305
16	16118927
17	57388086
18	589999787
19	647387873
20	1884775533
21	13840816604
22	29566408741

[27,55,137,1151,1288,3727,5015,18772,98875,117647, 569463,687110,1256573,1943683,7087622,9031305, 16118927,57388086,589999787,647387873,1884775533, 13840816604,29566408741]