This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A085560 #4 Mar 30 2012 17:30:55
%S A085560 1,3,8,21,56,151,410,1114,3027,8227,22362,60785,165230,449141,1220891,
%T A085560 3318725,9021229,24522242,66658364,181196219,492542389,1338869025,
%U A085560 3639423341,9892978333,26891903231,73099771885,198705781579
%N A085560 a(0) = 1, then (for n>0) a(n) = floor[(e + 1/e)*a(n-1) - a(n-2)].
%C A085560 A recursive series with [a(n+1)/a(n)] converging to e.
%C A085560 a(15)/a(14) = 3318725/1220891 = 2.71828115... floor[log a(n)] = n. Example: log a(15) = log 3318725 = 15.01509...; floor(15.015...) = 15.
%e A085560 a(5) = 151 = floor[(e + 1/e)*a(4) - a(3)] = floor[(e + 1/e)(56) - 21].
%t A085560 a[0] = 1; a[1] = 3; a[n_] := a[n] = Floor[(E + 1/E)*a[n - 1] - a[n - 2]]; Table[ a[n], {n, 0, 27}]
%Y A085560 Cf. A085421.
%K A085560 nonn
%O A085560 0,2
%A A085560 _Gary W. Adamson_, Jul 05 2003
%E A085560 More terms from _Robert G. Wilson v_, Jul 13 2003