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 A016972 #21 Apr 01 2022 09:10:47 %S A016972 625,14641,83521,279841,707281,1500625,2825761,4879681,7890481, %T A016972 12117361,17850625,25411681,35153041,47458321,62742241,81450625, %U A016972 104060401,131079601,163047361,200533921,244140625,294499921,352275361,418161601,492884401,577200625,671898241 %N A016972 a(n) = (6*n + 5)^4. %H A016972 Vincenzo Librandi, <a href="/A016972/b016972.txt">Table of n, a(n) for n = 0..1000</a> %H A016972 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (5,-10,10,-5,1). %F A016972 From _Chai Wah Wu_, Mar 20 2017: (Start) %F A016972 a(n) = 5*a(n-1) - 10*a(n-2) + 10*a(n-3) - 5*a(n-4) + a(n-5) for n > 4. %F A016972 G.f.: (-x^4 - 2396*x^3 - 16566*x^2 - 11516*x - 625)/(x - 1)^5. (End) %F A016972 From _Amiram Eldar_, Apr 01 2022: (Start) %F A016972 a(n) = A016969(n)^4 = A016970(n)^2. %F A016972 Sum_{n>=0} 1/a(n) = PolyGamma(3, 5/6)/7776. (End) %t A016972 Table[(6 n + 5)^4, {n, 0, 20}] (* _Michael De Vlieger_, Mar 20 2017 *) %o A016972 (Magma) [(6*n+5)^4: n in [0..40]]; // _Vincenzo Librandi_, May 07 2011 %Y A016972 Cf. A016969, A016970, A016971. %Y A016972 Subsequence of A000583. %K A016972 nonn,easy %O A016972 0,1 %A A016972 _N. J. A. Sloane_