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A009236 as a simple table

na(n)
01
12
220
3392
412560
5579872
636034880
72874676352
8284538241280
934058188677632
104831480473359360
11799233222752602112
12152126941229960990720
1332947584100184816033792
148042650107769696199720960
152194728130327915760239542272
16664779526701915421094019399680

[1,2,20,392,12560,579872,36034880,2874676352,
 284538241280,34058188677632,4831480473359360,
 799233222752602112,152126941229960990720,
 32947584100184816033792,8042650107769696199720960,
 2194728130327915760239542272,
 664779526701915421094019399680]