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A010908 as a simple table

na(n)
04
121
2110
3576
43016
515792
682688
7432960
82267008
911870208
1062153216
11325438464
121704017920
138922353664
1446718050304
15244618887168
161280841121792
176706571182080
1835116062605312
19183870090903552
20962756295000064
215041057406386176
2226395319258316800

[4,21,110,576,3016,15792,82688,432960,2267008,
 11870208,62153216,325438464,1704017920,8922353664,
 46718050304,244618887168,1280841121792,
 6706571182080,35116062605312,183870090903552,
 962756295000064,5041057406386176,
 26395319258316800]