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A113979 as a simple table

na(n)
01
10
22
31
46
56
620
728
872
9120
10272
11496
121056
132016
144160
158128
1616512
1732640
1865792
19130816
20262656
21523776
221049600
232096128
244196352
258386560
2616781312
2733550336
2867117056
29134209536
30268451840
31536854528
321073774592
332147450880

[1,0,2,1,6,6,20,28,72,120,272,496,1056,2016,4160,
 8128,16512,32640,65792,130816,262656,523776,
 1049600,2096128,4196352,8386560,16781312,33550336,
 67117056,134209536,268451840,536854528,1073774592,
 2147450880]