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 A227325 #14 Sep 30 2023 16:38:15 %S A227325 1,2,18,320,8750,326592,15529668,899678208,61556811030,4862000000000, %T A227325 435644983598396,43678490079264768,4846281282497517772, %U A227325 589650705050503577600,78074729079345703125000,11177395284330167371038720,1720546364146510165684599270 %N A227325 a(n) = A000272(n+1) * A000984(n). %H A227325 Reinhard Zumkeller, <a href="/A227325/b227325.txt">Table of n, a(n) for n = 0..250</a> %F A227325 a(n) = A088956(2*n, n) = (n+1)^(n-1) * C(2*n, n). %o A227325 (Haskell) %o A227325 a227325 n = a000272 (n + 1) * a000984 n %Y A227325 Cf. A000272, A000984. %Y A227325 Central terms of triangle A088956. %K A227325 nonn %O A227325 0,2 %A A227325 _Reinhard Zumkeller_, Jul 07 2013 %E A227325 Typo in formula fixed by _Zak Seidov_, Jul 08 2013