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Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A186656 as a simple table

na(n)
11
26
360
4587
57277
691470
71151734
814116900
9166220264
101888964884
1120910204634

[1,6,60,587,7277,91470,1151734,14116900,166220264,
 1888964884,20910204634]