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 A095219 #7 Aug 08 2015 20:17:13 %S A095219 22,433,78454,1112052505,160606060606,22070707070707,2908080808080808, %T A095219 370909090909090909,46101010101010101010,5611111111111111111111, %U A095219 671212121212121212121212,79131313131313131313131313,9293949517171716261615233314205014,106107108099816161515133215015015015015015015 %N A095219 First differences of A053067. %e A095219 a(2) = 456 - 23 = 433. %p A095219 A000124 := proc(n) n*(n+1)/2+1 ; end proc: %p A095219 catL := proc(L) local a; a := op(1,L) ; for i from 2 to nops(L) do a := cat2(a,op(i,L)) ; end do; a; end proc: %p A095219 A053067 := proc(n) local l ; l := A000124(n-1) ; catL([seq(k,k=l..l+n-1)]) ; end proc: %p A095219 A095219 := proc(n) A053067(n+1)-A053067(n) ; end proc: %p A095219 seq(A095219(n),n=1..15) ; # _R. J. Mathar_, Oct 14 2010 %K A095219 base,easy,less,nonn %O A095219 2,1 %A A095219 _Amarnath Murthy_, Jun 10 2004 %E A095219 Definition clarified by _R. J. Mathar_, Oct 14 2010