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A026947 as a simple table

na(n)
11
26
324
4144
5541
63258
712275
874280
9282003
101713690
116549906
1239938616
13153481299
14938430990
153622111560
1622195961280
1785975792075
18527816696850
192050493623760
2012607504827600
2149098707209695
22302275142049870
231179633190545755
247270432009471224
2528423658754983701

[1,6,24,144,541,3258,12275,74280,282003,1713690,
 6549906,39938616,153481299,938430990,3622111560,
 22195961280,85975792075,527816696850,
 2050493623760,12607504827600,49098707209695,
 302275142049870,1179633190545755,7270432009471224,
 28423658754983701]