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A374346 as a simple table

na(n)
01
12
26
320
488
5432
62464
714912
8111360
9912896
108491264
1180905728
12861835264
139524264960
14113218762752
151362387243008
1620665650774016
17337892698226688
186100999266304000
19106342541313572864
202014622956858638336
2137864490015441027072

[1,2,6,20,88,432,2464,14912,111360,912896,8491264,
 80905728,861835264,9524264960,113218762752,
 1362387243008,20665650774016,337892698226688,
 6100999266304000,106342541313572864,
 2014622956858638336,37864490015441027072]