A042444 - OEIS

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A042444 as a simple table

n	a(n)
0	27
1	55
2	82
3	137
4	356
5	1205
6	1561
7	2766
8	23689
9	26455
10	50144
11	176887
12	403918
13	580805
14	984723
15	2550251
16	138698277
17	279946805
18	418645082
19	698591887
20	1815828856
21	6146078455
22	7961907311
23	14107985766

[27,55,82,137,356,1205,1561,2766,23689,26455, 50144,176887,403918,580805,984723,2550251, 138698277,279946805,418645082,698591887, 1815828856,6146078455,7961907311,14107985766]