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A026661 as a simple table

na(n)
11
25
320
487
5358
61533
76445
827555
9117529
10503001
112167209
129289047
1340320051
14173069913
15755481768
163247042719
1714236984102
1861259521341
19269560841080
201161017915091
215123885956516
2222087793150253
2397719510829418

[1,5,20,87,358,1533,6445,27555,117529,503001,
 2167209,9289047,40320051,173069913,755481768,
 3247042719,14236984102,61259521341,269560841080,
 1161017915091,5123885956516,22087793150253,
 97719510829418]