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A089404 as a simple table

na(n)
01
11
22
34
410
526
674
7222
8698
92264
107536
1125600
1288406
13309440
141095354
153914340
1614102324
1751165004
18186774368
19685495334
202527957006

[1,1,2,4,10,26,74,222,698,2264,7536,25600,88406,
 309440,1095354,3914340,14102324,51165004,
 186774368,685495334,2527957006]