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A170815 as a simple table

na(n)
11
22
34
412
540
6116
7200
8444
9760
102160
114368
127852
1312828
1417252
1519612
1621104
1718276
1815096
1910240
206464
213776
222536

[1,2,4,12,40,116,200,444,760,2160,4368,7852,12828,
 17252,19612,21104,18276,15096,10240,6464,3776,
 2536]