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a(n) = floor(Pi * n^n).
1

%I #13 Sep 05 2019 10:32:48

%S 3,12,84,804,9817,146574,2587236,52707178,1217117362,31415926535,

%T 896333048374,28010755666909,951510209825447,34909399009812702,

%U 1375684229072362040,57952155664616982739,2598851929495812212466,123610386554497718683892,6215388655940089571017997

%N a(n) = floor(Pi * n^n).

%t Table[Floor[Pi*n^n],{n,20}] (* _Harvey P. Dale_, Apr 02 2018 *)

%o (PARI) a(n) = floor(Pi*n^n); \\ _Michel Marcus_, Sep 05 2019

%Y Cf. A000796, A022844, A147836.

%K nonn

%O 1,1

%A _Leroy Quet_, Nov 14 2008

%E Extended by _Ray Chandler_, Nov 24 2008