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 A065654 #8 Mar 19 2025 08:34:31 %S A065654 0,1,2,4,8,24,80,784,8288,1053024,115519040,2186083514944, %T A065654 26210587691915648,9556921325803348132669824, %U A065654 1373760651292040932579353684066560,182669489453303120238622839813317479832750842872064 %N A065654 Fixed points for A065652, a permutation of the natural numbers. %H A065654 Amiram Eldar, <a href="/A065654/b065654.txt">Table of n, a(n) for n = 0..23</a> %F A065654 a(n) = (A065653(n) + A065653(n+1) - 1) / 2. %t A065654 f[n_] := f[n] = If[n < 2, n, f[n - 2]^2 + 2]; a[n_] := (f[n] + f[n + 1] - 1)/2; Array[a, 15, 0] (* _Amiram Eldar_, Mar 19 2025 *) %Y A065654 Cf. A065652, A065653. %K A065654 nonn %O A065654 0,3 %A A065654 _Reinhard Zumkeller_, Nov 10 2001