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A100621 as a simple table

na(n)
01
12
26
38
490
5288
6840
717280
828350
989600
10598752
1117418240
1263063000
13402361344000
145003856000
15295206912
16976924698750
17342372925440000
1815209113920000
195377993912811520000
2096852084769440
2189903156428800000
2237556196837868800000
2373570956727261593600000

[1,2,6,8,90,288,840,17280,28350,89600,598752,
 17418240,63063000,402361344000,5003856000,
 295206912,976924698750,342372925440000,
 15209113920000,5377993912811520000,96852084769440,
 89903156428800000,37556196837868800000,
 73570956727261593600000]