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 A251723 #12 Mar 29 2015 22:58:07 %S A251723 1,4,5,14,8,21,10,26,46,15,56,43,19,45,79,77,31,89,65,29,105,74,113, %T A251723 162,88,41,86,41,99,353,98,164,48,298,57,181,185,127,197,194,75,355, %U A251723 76,143,74,462,478,167,81,165,269,89,437,274,273,291,90,291,198,98,511,734,219,106,214,783,340,578,124,240,362,488,380,379,251,393,529,261,530,669,150,708,150 %N A251723 First differences of A054272, A250473 and A250474: a(n) = A054272(n+1) - A054272(n). %H A251723 Antti Karttunen, <a href="/A251723/b251723.txt">Table of n, a(n) for n = 1..5000</a> %F A251723 a(n) = A054272(n+1) - A054272(n). %F A251723 a(n) = A256447(n) + A256448(n). [Cf. also A256449.] %o A251723 (Scheme, two variants) %o A251723 (define (A251723 n) (- (A054272 (+ n 1)) (A054272 n))) %o A251723 (define (A251723 n) (- (A250474 (+ n 1)) (A250474 n))) %Y A251723 One less than A050216, the first differences of A000879. %Y A251723 Cf. A054272, A250473, A250474, A251719, A256446, A256447, A256448, A256449. %K A251723 nonn %O A251723 1,2 %A A251723 _Antti Karttunen_, Dec 15 2014