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A259612 as a simple table

na(n)
11
21
36
458
5720
610506
7172284
83092717
959758608
101228626514
1126657057728
12606616602302
1314410894287172
14356081682054300
159124705519233832
16241916247567814448
176622686675121529288
18186900262172114801748
195429779249015331564288
20162190080378495122207760

[1,1,6,58,720,10506,172284,3092717,59758608,
 1228626514,26657057728,606616602302,
 14410894287172,356081682054300,9124705519233832,
 241916247567814448,6622686675121529288,
 186900262172114801748,5429779249015331564288,
 162190080378495122207760]