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A157856 as a simple table

n a(n)
0 1
1 15
2 56
3 1665
4 3080
5 45375
6 166376
7 9718545
8 8833160
9 127944225
10 461568296
11 13274709555
12 23784791240
13 339933981675
14 1211397511016
15 137818710619425
16 61120313133320
17 865798969339725
18 3061200012378536
19 86466681946098645
20 152460758526595400

[1,15,56,1665,3080,45375,166376,9718545,8833160,
 127944225,461568296,13274709555,23784791240,
 339933981675,1211397511016,137818710619425,
 61120313133320,865798969339725,3061200012378536,
 86466681946098645,152460758526595400]

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Last modified October 22 13:15 EDT 2021. Contains 348170 sequences. (Running on oeis4.)