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A088991 as a simple table

na(n)
01
10
24
332
4432
57424
6157120
73949056
8114972928
93805503488
10141137150976
115797706178560
12261309106499584
1312821127008550912
14680286677982625792
1538814037079505895424
162369659425449311272960
17154142301601844298776576
1810642813349855965483368448

[1,0,4,32,432,7424,157120,3949056,114972928,
 3805503488,141137150976,5797706178560,
 261309106499584,12821127008550912,
 680286677982625792,38814037079505895424,
 2369659425449311272960,154142301601844298776576,
 10642813349855965483368448]