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 A135014 #11 Sep 18 2015 03:44:00
%S A135014 2,6,342,8372,15006,32942,45156,170982,369056,3008490,3954132,
%T A135014 644931420,2009953056,12824996256,688604539866900,11580326725041402,
%U A135014 26067179544075560,94815133778597582,502907499251402082,3337168950979864272,7864766939956291580
%N A135014 Intersection of A002378 and A135013.
%p A135014 A000265 := proc(n) local nshft ; if n mod 2 = 1 then RETURN(n); else nshft := n ; while nshft mod 2 = 0 do nshft := nshft/2 ; od ; RETURN(nshft) ; fi ; end: A135013 := proc(n) option remember ; if n = 1 then RETURN(1) ; else RETURN( A135013(n-1)+A000265(n)) ; fi ; end: isA002378 := proc(n) RETURN( issqr(1+4*n) ) ; end: for n from 1 do a135013 := A135013(n) ; if isA002378(a135013) then printf("%d, ",a135013) ; fi ; od: # _R. J. Mathar_, Feb 11 2008
%Y A135014 Cf. A000918, A002378, A135013.
%K A135014 nonn
%O A135014 1,1
%A A135014 _N. J. A. Sloane_, Feb 10 2008
%E A135014 More terms from _R. J. Mathar_, Feb 11 2008
%E A135014 a(15)-a(19) from _Donovan Johnson_, Aug 08 2010
%E A135014 a(20)-a(21) from _Donovan Johnson_, Jul 24 2011