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A376482 as a simple table

na(n)
11
21
34
46
530
672
7336
8720
94864
109900
1154498
12139968
13728208
141820448
1511748240
1623224320
17142888536
18424189440
192066689584
204704480000
2134426570752
2275016279008
23437072997306
241171108896768
256391042560000
2616287748233120
27111155542830144
28225354102607872
291419514150386528
303983428743840000
3121252009311404938
3249614674429214720

[1,1,4,6,30,72,336,720,4864,9900,54498,139968,
 728208,1820448,11748240,23224320,142888536,
 424189440,2066689584,4704480000,34426570752,
 75016279008,437072997306,1171108896768,
 6391042560000,16287748233120,111155542830144,
 225354102607872,1419514150386528,3983428743840000,
 21252009311404938,49614674429214720]