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A138877 as a simple table

na(n)
166
22828
3496496
4812128
5335336
6858056
7137328
8230128
9265176
10191216
11131128
12144128
13235976
14141128
15541328
16108528
17994776
18335056
19182536
20407528
21114216
22598576
23395336
24931656
25100376
26811816
27365456
28144528
29136528
30131016
31278128

[66,2828,496496,812128,335336,858056,137328,
 230128,265176,191216,131128,144128,235976,141128,
 541328,108528,994776,335056,182536,407528,114216,
 598576,395336,931656,100376,811816,365456,144528,
 136528,131016,278128]