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A026376 as a simple table

na(n)
11
26
330
4144
5685
63258
715533
874280
9356283
101713690
118263596
1239938616
13193419915
14938430990
154560542550
1622195961280
17108171753355
18527816696850
192578310320610
2012607504827600
2161706212037295
22302275142049870
231481908332595625
247270432009471224

[1,6,30,144,685,3258,15533,74280,356283,1713690,
 8263596,39938616,193419915,938430990,4560542550,
 22195961280,108171753355,527816696850,
 2578310320610,12607504827600,61706212037295,
 302275142049870,1481908332595625,7270432009471224]