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 A281595 #9 Jul 10 2024 14:46:35 %S A281595 0,0,0,1,10,125,1890,33621,688506,15958405,413066170,11810819141, %T A281595 369730963602,12577271147805,461980538087250,18223376862518101, %U A281595 768327068469302218,34480595937671194805,1641060381277816308810,82562177153973368528901,4378026144983797903473954 %N A281595 a(n) = (n^n - 3*(n-1)^n + 3*(n-2)^n - (n-3)^n)/6. %H A281595 Paolo Xausa, <a href="/A281595/b281595.txt">Table of n, a(n) for n = 0..380</a> %p A281595 a := n -> (n^n-3*(n-1)^n+3*(n-2)^n-(n-3)^n)/6: %p A281595 seq(a(n), n=0..20); %t A281595 A281595[n_] := If[n == 0, 0, (n^n - 3*(n-1)^n + 3*(n-2)^n - (n-3)^n)/6]; %t A281595 Array[A281595, 25, 0] (* _Paolo Xausa_, Jul 10 2024 *) %Y A281595 Cf. A000312, A045531, A281596. %K A281595 nonn %O A281595 0,5 %A A281595 _Peter Luschny_, Jan 26 2017