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A013554 as a simple table

na(n)
02
18
2556
3496
4717572
552939408
6870202072
7964225030112
8657454597470988
927485377040128048
10700808303776317525176
111479866177061564649568
121640650015131154843789016
1313376815891310731844679270304
1425395222315410089406698868631728

[2,8,556,496,717572,52939408,870202072,
 964225030112,657454597470988,27485377040128048,
 700808303776317525176,1479866177061564649568,
 1640650015131154843789016,
 13376815891310731844679270304,
 25395222315410089406698868631728]