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A261647 as a simple table

na(n)
01
16
218
344
4102
5216
6428
7816
81494
92650
104584
117740
1212804
1320808
1433264
1552400
1681462
17125100
18189966
19285516
20425016
21627040
22917436
231331856
241919332
252746926
263905784
275519352
287754064
2910833192
3015055216
3120817600
3228647414
3339241336
3453517060

[1,6,18,44,102,216,428,816,1494,2650,4584,7740,
 12804,20808,33264,52400,81462,125100,189966,
 285516,425016,627040,917436,1331856,1919332,
 2746926,3905784,5519352,7754064,10833192,15055216,
 20817600,28647414,39241336,53517060]