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 A252373 #9 Dec 18 2014 02:07:12 %S A252373 0,1,2,3,4,5,6,7,8,8,9,10,11,11,12,13,14,15,16,16,17,17,18,19,20,20, %T A252373 21,21,22,22,23,24,24,24,25,26,27,27,27,27,28,28,29,29,30,30,31,32,33, %U A252373 33,33,33,34,35,36,36,36,36,37,37,38,38,39,40,41,41,42,42,42,42,43,44,45,45,46,46,47,47,48,48,49,49,50 %N A252373 Partial sums of A252372, inverse function for A251726. %H A252373 Antti Karttunen, <a href="/A252373/b252373.txt">Table of n, a(n) for n = 1..10001</a> %F A252373 a(1) = 0, a(n) = A252372(n) + a(n-1). %F A252373 Other identities. For all n >= 1: %F A252373 a(A251726(n)) = n. [This works as an inverse or ranking function for the injection A251726.] %o A252373 (Scheme, with memoization-macro definec) %o A252373 (definec (A252373 n) (if (<= n 1) 0 (+ (A252372 n) (A252373 (- n 1))))) %Y A252373 Cf. A251726, A252372, A252459. %K A252373 nonn %O A252373 1,3 %A A252373 _Antti Karttunen_, Dec 17 2014