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%I #29 Jul 13 2021 06:22:32
%S 0,2,6,17,46,127,346,942,2561,6961,18923,51440,139829,380095,1033206,
%T 2808546,7634421,20752508,56411165,153341447,416825269,1133048555,
%U 3079945300,8372159341,22757888603,61862355045,168159315586,457104411844,1242538616426
%N a(n) = floor(cosh(n+1) - cosh(n)).
%e For n = 3, a(3) = 17 because the difference between cosh(4) and cosh(3) is 17.24057..., and floor(17.24057...) = 17.
%t a[n_] := Floor[Cosh[n+1] - Cosh[n]]; Array[a, 30,0] (* _Amiram Eldar_, Jul 12 2021 *)
%o (C++)
%o #include <iostream>
%o #include <cmath>
%o using namespace std; int main(int argc, char** argv){for (int n=0; n<=10; n++) {double val = cosh(n+1)-cosh(n); int a = floor(val); cout << a <<","; }}
%Y Cf. A000501.
%K nonn
%O 0,2
%A _Treanungkur Mal_, Jul 08 2021
%E More terms from _Jinyuan Wang_, Jul 08 2021
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