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 A279340 #10 Mar 15 2017 20:28:26
%S A279340 3,1,3,3,1,1,3,3,1,3,3,1,1,1,3,3,1,3,3,1,1,3,3,1,3,3,1,1,1,1,3,3,1,3,
%T A279340 3,1,1,3,3,1,3,3,1,1,1,3,3,1,3,3,1,1,3,3,1,3,3,1,1,1,1,1,3,3,1,3,3,1,
%U A279340 1,3,3,1,3,3,1,1,1,3,3,1,3,3,1,1,3,3,1,3,3,1,1,1,1,3,3,1,3,3,1,1,3,3,1,3,3,1,1,1,3,3,1,3,3,1,1,3,3,1,3,3
%N A279340 First differences of A055938.
%H A279340 Antti Karttunen, <a href="/A279340/b279340.txt">Table of n, a(n) for n = 1..8191</a>
%F A279340 a(n) = A055938(1+n) - A055938(n).
%t A279340 Differences@ Complement[Range@ Last@ #, #] &@ Table[IntegerExponent[(2 n)!, 2], {n, 0, 120}] (* _Michael De Vlieger_, Mar 15 2017, after _Jean-François Alcover_ at A055938 *)
%o A279340 (Scheme) (define (A279340 n) (- (A055938 (+ 1 n)) (A055938 n)))
%Y A279340 Cf. A007814, A055938, A079559, A279353.
%K A279340 nonn
%O A279340 1,1
%A A279340 _Antti Karttunen_, Mar 15 2017