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A201248 as a simple table

na(n)
10
20
30
4216
538070
61314600
721191208
8207830308
91442794332
107775083960
1134530764200
12131660992164
13443702617356
141350258600008
153771242866680
169789675562020
1723856321869260
1855015308882264
19120855465245464
20254284702668580
21514791197224860
221006655249550696

[0,0,0,216,38070,1314600,21191208,207830308,
 1442794332,7775083960,34530764200,131660992164,
 443702617356,1350258600008,3771242866680,
 9789675562020,23856321869260,55015308882264,
 120855465245464,254284702668580,514791197224860,
 1006655249550696]