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A017950 as a simple table

n a(n)
0 1
1 4
2 15
3 58
4 225
5 871
6 3375
7 13071
8 50625
9 196070
10 759375
11 2941047
12 11390625
13 44115701
14 170859375
15 661735514
16 2562890625
17 9926032709
18 38443359375
19 148890490632
20 576650390625
21 2233357359475
22 8649755859375

[1,4,15,58,225,871,3375,13071,50625,196070,759375,
 2941047,11390625,44115701,170859375,661735514,
 2562890625,9926032709,38443359375,148890490632,
 576650390625,2233357359475,8649755859375]

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Last modified December 8 02:41 EST 2021. Contains 349590 sequences. (Running on oeis4.)