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A176644 as a simple table

na(n)
01
11
21
31
440
51
61
71600
81600
91
101
1164000
122560000
1364000
141
151
162560000
174096000000
184096000000
192560000
201
211
22102400000
236553600000000
24262144000000000
256553600000000
26102400000
271
281
294096000000
3010485760000000000
3116777216000000000000
3216777216000000000000
3310485760000000000
344096000000
351

[1,1,1,1,40,1,1,1600,1600,1,1,64000,2560000,64000,
 1,1,2560000,4096000000,4096000000,2560000,1,1,
 102400000,6553600000000,262144000000000,
 6553600000000,102400000,1,1,4096000000,
 10485760000000000,16777216000000000000,
 16777216000000000000,10485760000000000,4096000000,
 1]