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A006455 as a simple table

na(n)
01
11
22
37
440
5357
64824
796428
82800472
9116473461
106855780268
11565505147444
1264824245807684

[1,1,2,7,40,357,4824,96428,2800472,116473461,
 6855780268,565505147444,64824245807684]