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 A079166 #4 Mar 30 2012 18:51:39 %S A079166 1,0,1,1,1,1,10,7,2,1,141,71,13,3,1,2548,1001,132,19,4,1,56197,18089, %T A079166 1861,193,25,5,1,1463670,398959,33630,2721,254,31,6,1,43966297, %U A079166 10391023,741721,49171,3581,315,37,7,1,1496317768,312129649,19318376,1084483 %N A079166 Square array read by antidiagonals of T(n,k)=(4k-2)*T(n,k-1)+T(n,k-2) with T(n,0)=1 and T(n,1)=n. %F A079166 T(n, k) =2*T(n-1, k)-T(n-2, k). T(n, k)/T(1, k) tends to ( (n-1)*e - (n-3) )/2 as k increases: e.g. T(3, k)/T(1, k) tends to e. %e A079166 Rows start: 1,0,1,10,141,2548,56197,...; 1,1,7,71,1001,18089,398959,...; 1,2,13,132,1861,33630,741721,...; 1,3,19,193,2721,49171,1084483,...; etc. %Y A079166 Rows include A002119 (unsigned), A079165, A001517. Columns include A000012, A001477, A016921 (offset). %K A079166 nonn,tabl %O A079166 0,7 %A A079166 _Henry Bottomley_, Dec 31 2002