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A223921 as a simple table

n a(n)
1 15
2 225
3 2111
4 14123
5 74040
6 323394
7 1226491
8 4157102
9 12856218
10 36834899
11 98904313
12 251078009
13 606789828
14 1403779390
15 3122765753
16 6704628063
17 13936852281
18 28123662137
19 55220811463
20 105715542647
21 197678421680

[15,225,2111,14123,74040,323394,1226491,4157102,
 12856218,36834899,98904313,251078009,606789828,
 1403779390,3122765753,6704628063,13936852281,
 28123662137,55220811463,105715542647,197678421680]

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Last modified June 27 04:01 EDT 2022. Contains 354888 sequences. (Running on oeis4.)