A042270 - OEIS

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A042270 as a simple table

n	a(n)
0	25
1	26
2	77
3	180
4	797
5	3368
6	54685
7	58053
8	577162
9	1212377
10	1789539
11	22686845
12	115223764
13	137910609
14	253134373
15	391044982
16	1035224337
17	1426269319
18	5314032294
19	6740301613
20	12054333907
21	42903303334

[25,26,77,180,797,3368,54685,58053,577162,1212377, 1789539,22686845,115223764,137910609,253134373, 391044982,1035224337,1426269319,5314032294, 6740301613,12054333907,42903303334]