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A268163 as a simple table

na(n)
00
11
21
34
425
5220
62485
734300
8559405
910525900
10224449225
115348843500
12140880765025
134063875715900
14127418482316125
154314607214417500
16156920190449147125
176100643259005795500
18252476539015516440625
1911081983532721088487500
20514215436341672155715625

[0,1,1,4,25,220,2485,34300,559405,10525900,
 224449225,5348843500,140880765025,4063875715900,
 127418482316125,4314607214417500,
 156920190449147125,6100643259005795500,
 252476539015516440625,11081983532721088487500,
 514215436341672155715625]