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 A138016 #4 Apr 02 2022 14:23:01 %S A138016 1,2,4,6,10,14,24,34,68,102,256,410,1284,2158,8072,13986 %N A138016 Row sums of triangle A138015. %F A138016 Repeat each nonzero term of A003422 once, then take partial sums. %e A138016 a(5) = 10 = sum of row 5 terms of triangle A138015: (1 + 2 + 4 + 2 + 1). %e A138016 a(5) = 10 = (1 + 1 + 2 + 2 + 4) since A003422 starting (1, 2, 4, 10, 34, 154, ...) then repeating each term = (1, 1, 2, 2, 4, 4, 10, 10, ...). Take partial sums of the first 5 terms. %Y A138016 Cf. A003422, A138015. %K A138016 nonn %O A138016 1,2 %A A138016 _Gary W. Adamson_, Feb 28 2008