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A086346 as a simple table

na(n)
01
13
218
380
4400
51904
69248
744544
8215296
91039104
105018112
1124227840
12116985856
13564850688
142727354368
1513168803840
1663584665600
17307013812224
181482394042368
197157631156224
2034560101318656
21166870928850944
22805724122775552
233890380202311680
2418784417308737536
2590699190027419648

[1,3,18,80,400,1904,9248,44544,215296,1039104,
 5018112,24227840,116985856,564850688,2727354368,
 13168803840,63584665600,307013812224,
 1482394042368,7157631156224,34560101318656,
 166870928850944,805724122775552,3890380202311680,
 18784417308737536,90699190027419648]