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A218999
as a simple table
n
a(n)
1
12
2
604
3
16648
4
462668
5
13259232
6
377629096
7
10745153084
8
305936314868
9
8710085382952
[12,604,16648,462668,13259232,377629096, 10745153084,305936314868,8710085382952]