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 A049069 #11 Mar 07 2020 01:16:12
%S A049069 1,1,2,1,3,5,1,4,9,13,1,5,13,25,33,1,6,17,37,65,81,1,7,21,49,97,161,
%T A049069 193,1,8,25,61,129,241,385,449,1,9,29,73,161,321,577,897,1025,1,10,33,
%U A049069 85,193,401,769,1345,2049,2305,1,11,37,97,225,481,961,1793,3073,4609,5121
%N A049069 Array T read by antidiagonals: T(k,n) = k*n*2^(n-1) + 1, n >= 0, k >= 1.
%e A049069 Antidiagonals: {1}; {1,2}; {1,3,5}; ...
%o A049069 (PARI) T(k,n)=k*n*2^(n-1)+1
%Y A049069 Transpose of the array in A048472.
%Y A049069 Row 1 = (1, 2, 5, 13, 33, ...) = A005183.
%Y A049069 Row 2 = (1, 3, 9, 25, 65, ...) = A002064.
%Y A049069 Cf. A049513.
%Y A049069 Essentially the same as A049513.
%K A049069 nonn,tabl,easy
%O A049069 0,3
%A A049069 _N. J. A. Sloane_, _Clark Kimberling_, _Michael Somos_