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 A134315 #9 Jan 22 2020 15:08:52 %S A134315 1,1,1,0,2,2,0,0,4,4,0,0,0,8,8,0,0,0,0,16,16,0,0,0,0,0,32,32,0,0,0,0, %T A134315 0,0,64,64 %N A134315 A134309 * A097806. %C A134315 A134315 * [1,2,3,...] = A128135: (1, 3, 10 28, 72, 176, 416, ...). %C A134315 Triangle read by rows given by [1,-1,0,0,0,0,0,0,...] DELTA [1,1,0,0,0,0,0,0,0,...] where DELTA is the operator defined in A084938. - _Philippe Deléham_, Oct 20 2007 %F A134315 A134309 * A134315 as infinite lower triangular matrices. Triangle read by rows, for n>1, (n-1) zeros followed by 2^(n-1), 2^(n-1). As an infinite lower triangular matrix, (1, 1, 2, 4, 8, ...) in the main diagonal and (1, 2, 4, 8, ...) in the subdiagonal. %F A134315 G.f.: (-1-x+x*y)/(-1+2*x*y). - _R. J. Mathar_, Aug 11 2015 %e A134315 First few rows of the triangle are: %e A134315 1; %e A134315 1, 1; %e A134315 0, 2, 2; %e A134315 0, 0, 4, 4; %e A134315 0, 0, 0, 8, 8; %e A134315 ... %Y A134315 Cf. A134309, A097806, A128135. %K A134315 nonn,tabl,easy %O A134315 1,5 %A A134315 _Gary W. Adamson_, Oct 19 2007