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a(n) = round(e^(Pi*sqrt(n))).
3

%I #15 Jun 04 2018 17:53:44

%S 1,23,85,231,535,1124,2198,4072,7228,12392,20632,33506,53252,83048,

%T 127359,192401,286751,422151,614552,885480,1263795,1787960,2508952,

%U 3493970,4831164,6635624,9056943,12288744,16580631,22253151,29716459

%N a(n) = round(e^(Pi*sqrt(n))).

%H Seiichi Manyama, <a href="/A056580/b056580.txt">Table of n, a(n) for n = 0..200</a>

%o (PARI) {a(n) = round(exp(Pi*sqrt(n)))} \\ _Seiichi Manyama_, Jun 04 2018

%Y Cf. A019296, A019297, A035484, A056581.

%K nonn

%O 0,2

%A _Henry Bottomley_, Jun 30 2000

%E Definition corrected by _Michael Somos_, Sep 15 2008