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 A265909 #7 Jan 17 2016 14:12:59 %S A265909 2,15,58,126,475,1006,2036,4093,16006,32584,65402,130934,262095, %T A265909 524251,1048554,2097148 %N A265909 Submain diagonal of array A265903: a(n) = A265903(n+1, n). %F A265909 a(n) = A265903(n+1, n). %o A265909 (Scheme) (define (A265909 n) (A265903bi (+ 1 n) n)) ;; Code for A265903bi given in A265903. %Y A265909 Cf. A265903, A265900. %K A265909 nonn,more %O A265909 1,1 %A A265909 _Antti Karttunen_, Jan 10 2016