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A013041 as a simple table

na(n)
01
14
232
3544
417536
5997504
691956224
712588279552
82388796493824
9598131709419520
10190679121272193024
1175328224099389177856
1236099809995192945868800
1320626251224635998952554496

[1,4,32,544,17536,997504,91956224,12588279552,
 2388796493824,598131709419520,190679121272193024,
 75328224099389177856,36099809995192945868800,
 20626251224635998952554496]