login

A339850 as a simple table

na(n)
21
34
413
544
6148
7498
81676
95640
1018980
1163872
12214944
13723336
142434192
158191616
1627566672
1792768192
18312186304
191050578720
203535439040
2111897565568
2240038044736
23134737229824
24453421769728
251525868548224
265134898635008
2717280115002368
2858151561641216

[1,4,13,44,148,498,1676,5640,18980,63872,214944,
 723336,2434192,8191616,27566672,92768192,
 312186304,1050578720,3535439040,11897565568,
 40038044736,134737229824,453421769728,
 1525868548224,5134898635008,17280115002368,
 58151561641216]