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 A172283 #19 Jan 25 2020 01:26:45
%S A172283 1,-9,11,-9,2,11,-9,-7,13,11,-9,-16,6,24,11,-9,-25,-10,30,35,11,-9,
%T A172283 -34,-35,20,65,46,11,-9,-43,-69,-15,85,111,57,11,-9,-52,-112,-84,70,
%U A172283 196,168,68,11,-9,-61,-164,-196,-14,266,364,236,79,11
%N A172283 (-9,11) Pascal triangle.
%C A172283 Triangle T(n,k), read by rows, given by [-9,10,0,0,0,0,0,0,0,...] DELTA [11,-10,0,0,0,0,0,0,0,...] where DELTA is the operator defined in A084938. - _Philippe Deléham_, Feb 01 2010
%F A172283 With offset 0: Sum_{k=0..n} T(n,k) = 2^n. - _Philippe Deléham_, Feb 01 2010
%F A172283 T(n,k) = T(n-1,k-1) + T(n-1,k) with T(0,0)=1, T(1,0)=-9, T(1,1)=1. - _Philippe Deléham_, Oct 08 2011
%F A172283 G.f.: (1-10*x+10*y*x)/(1-x-y*x). - _Philippe Deléham_, Apr 13 2012
%e A172283 Triangle begins:
%e A172283 1
%e A172283 -9, 11
%e A172283 -9, 2, 11
%e A172283 -9, -7, 13, 11
%e A172283 -9, -16, 6, 24, 11
%Y A172283 Cf. A093644, A172179, A022114, A000984.
%K A172283 tabl,sign
%O A172283 0,2
%A A172283 _Mark Dols_, Jan 30 2010
%E A172283 More terms from _Philippe Deléham_, Oct 08 2011