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a(n) = floor(cosh(n)).
4

%I #15 Feb 01 2022 01:00:02

%S 1,1,3,10,27,74,201,548,1490,4051,11013,29937,81377,221206,601302,

%T 1634508,4443055,12077476,32829984,89241150,242582597,659407867,

%U 1792456423,4872401723,13244561064,36002449668,97864804714,266024120300,723128532145,1965667148572

%N a(n) = floor(cosh(n)).

%H T. D. Noe, <a href="/A000501/b000501.txt">Table of n, a(n) for n = 0..250</a>

%p f := n->floor(evalf(cosh(n)));

%t Table[Floor[Cosh[n]], {n, 0, 50}] (* _T. D. Noe_, Jun 20 2012 *)

%Y Cf. A000471.

%K nonn

%O 0,3

%A _N. J. A. Sloane_

%E Corrected and extended by _Franklin T. Adams-Watters_, Apr 26 2006