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A064025 as a simple table

na(n)
21
32
42
52
64
72
816
948
108
114
1256
13180
1444
15156
16300
177936
1810388
1911516
209104
2113469268
222684084
232418800
2428468692
25143007944
2685509116
27402570696
282287868888
29204306960
3048715166536
31147160740856
32317585614148

[1,2,2,2,4,2,16,48,8,4,56,180,44,156,300,7936,
 10388,11516,9104,13469268,2684084,2418800,
 28468692,143007944,85509116,402570696,2287868888,
 204306960,48715166536,147160740856,317585614148]