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A216991 as a simple table

na(n)
10
20
30
40
52
60
70
814
914
100
110
1280
13264
1480
150
160
17436
184794
194794
20436
210
220
232346
2483304
25280900
2683304
272346
280
290
3012578
311435808
3215836932
3315836932
341435808
3512578
360
370
3867368
3924673352
40886416182
412891592224
42886416182
4324673352
4467368
450
460
47360720

[0,0,0,0,2,0,0,14,14,0,0,80,264,80,0,0,436,4794,
 4794,436,0,0,2346,83304,280900,83304,2346,0,0,
 12578,1435808,15836932,15836932,1435808,12578,0,0,
 67368,24673352,886416182,2891592224,886416182,
 24673352,67368,0,0,360720]