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A350645 as a simple table

na(n)
01
12
28
336
4170
5824
64060
720232
8101664
9514140
102613468
1113340496
1268335644
13351087128
141808405600
159335697424
1648289295226
17250213951992
181298517484804
196748250144600
2035114221973600
21182924946400680
22953931045159000
234979398271047200
2426014703727203100

[1,2,8,36,170,824,4060,20232,101664,514140,
 2613468,13340496,68335644,351087128,1808405600,
 9335697424,48289295226,250213951992,1298517484804,
 6748250144600,35114221973600,182924946400680,
 953931045159000,4979398271047200,
 26014703727203100]