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 A028275 #10 Jun 22 2013 16:05:34 %S A028275 1,1,1,1,4,1,1,5,5,1,1,6,10,6,1,1,7,16,16,7,1,1,8,23,32,23,8,1,1,9,31, %T A028275 55,55,31,9,1,1,10,40,86,110,86,40,10,1,1,11,50,126,196,196,126,50,11, %U A028275 1,1,12,61,176,322,392,322,176,61,12,1,1,13,73,237,498,714,714,498,237 %N A028275 Elements in 4-Pascal triangle (by row). %F A028275 Apart from first 3 rows, use the Pascal rule. %F A028275 T(n, k) = C(n, k) + 2C(n-2, k-1). G.f.: (1+2x^2y) / [1-x(1+y)]. - _Ralf Stephan_, Jan 31 2005 %e A028275 1; 1 1; 1 4 1; 1 5 5 1; 1 6 10 6 1; ... %Y A028275 Cf. A028262, A028313. %K A028275 easy,nonn %O A028275 0,5 %A A028275 _Mohammad K. Azarian_ %E A028275 More terms from Ben Baugher (s1191623(AT)cedarville.edu)