%I #8 Apr 03 2016 14:12:52
%S 4,5,7,8,10,12,13,14,15,16,17,19,21,22,23,24,25,28,29,30,31,32,33,34,
%T 35,37,39,40,41,42,43,44,45,46,47,49,50,51,52,53,54,55,56,57,58,59,60,
%U 62,63,65,66,67,68,69,70,71,72,73,74,76,77,78,79,80,81,82,83,84,85,86
%N Second differences of A037257.
%F a(n) = A037257(n+2) - 2*A037257(n+1) + A037257(n).
%Y Cf. A005228, A030124, A037257.
%K nonn,easy
%O 0,1
%A _N. J. A. Sloane_.
%E More terms from Larry Reeves (larryr(AT)acm.org), Sep 25 2000