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 A161740 #7 Jun 02 2025 01:44:32 %S A161740 0,30,425,3008,14572,55060,174130,481360,1197196,2733874,5817955, %T A161740 11668800,22250280,40616264,71373956,121292960,200092040,321439910, %U A161740 504211037,774042368,1165242100,1723107100,2506711350,3592233840 %N A161740 Fourth right hand column of the RSEG2 triangle A161739. %F A161740 a(n) = (n+4)*(n+3)*(n+2)*(n+1)*(n)*(n-1)*(35*n^3+189*n^2+325*n+204)/45360 %F A161740 The denominator of a(n) (45360) equals the product of the first three terms of A036283 (6*60*126). - _Johannes W. Meijer_, Oct 22 2009 %Y A161740 Equals fourth right hand column of A161739 (RSEG2 triangle). %Y A161740 Other right hand columns are A000292, A107963, A161741. %K A161740 easy,nonn %O A161740 1,2 %A A161740 _Johannes W. Meijer_ & Nico Baken (n.h.g.baken(AT)tudelft.nl), Jun 18 2009