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A011906 as a simple table

na(n)
11
218
3525
417340
5586177
619896030
7675781821
822956120408
9779829016225
1026491211221770
11899921240562957
1230570830315362260
131038508305678375841
1435278711540581704598
151198437683944896688125
1640711602541832856049200
171382996048733983114022337

[1,18,525,17340,586177,19896030,675781821,
 22956120408,779829016225,26491211221770,
 899921240562957,30570830315362260,
 1038508305678375841,35278711540581704598,
 1198437683944896688125,40711602541832856049200,
 1382996048733983114022337]