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A170812 as a simple table

na(n)
11
22
34
412
540
6116
7200
8444
9760
102160
114368
127852
1312828
1417252
1521136
1628716
1737276
1853624
1976740
20114856
21180232
22290280

[1,2,4,12,40,116,200,444,760,2160,4368,7852,12828,
 17252,21136,28716,37276,53624,76740,114856,180232,
 290280]