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A320934 as a simple table

na(n)
10
20
31
44
520
680
7336
81344
95440
1021760
1187296
12349184
131397760
145591040
1522368256
1689473024
17357908480
181431633920
195726601216
2022906404864
2191625881600
22366503526400
231466015154176
245864060616704
2523456246661120
2693824986644480
27375299963355136
281501199853420544
296004799480791040

[0,0,1,4,20,80,336,1344,5440,21760,87296,349184,
 1397760,5591040,22368256,89473024,357908480,
 1431633920,5726601216,22906404864,91625881600,
 366503526400,1466015154176,5864060616704,
 23456246661120,93824986644480,375299963355136,
 1501199853420544,6004799480791040]