%I A135387
%S A135387 2,1,2,0,1,2,0,0,1,2,0,0,0,1,2,0,0,0,0,1,2,0,0,0,0,0,1,2,0,0,0,0,0,0,1,
%T A135387 2,0,0,0,0,0,0,0,1,2
%N A135387 Triangle read by rows, with (2, 1, 0, 0, 0,...) in every column.
%C A135387 Let the triangle = M, then M^n * [1, 1, 0, 0, 0,...] generates rows of 
               triangle A118800. M^n * [1, 0, 0, 0,...] generates rows of triangle 
               A038207.
%C A135387 Eigensequence of the triangle = the Pell numbers, A000129: (1, 2, 5, 
               12, 29,...). [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Dec 29 
               2008]
%F A135387 Triangle by columns (2, 1, 0, 0, 0, 0, 0,...) in every column. By rows, 
               (n-2) zeros followed by 1, 2.
%e A135387 First few rows of the triangle are:
%e A135387 2;
%e A135387 1, 2
%e A135387 0, 1, 2;
%e A135387 0, 0, 1, 2;
%e A135387 0, 0, 0, 1, 2;
%e A135387 0, 0, 0, 0, 1, 2;
%e A135387 ...
%Y A135387 Cf. A118800, A038207.
%Y A135387 A000129 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Dec 29 2008]
%Y A135387 Sequence in context: A027414 A140083 A057985 this_sequence A127442 A115628 
               A114002
%Y A135387 Adjacent sequences: A135384 A135385 A135386 this_sequence A135388 A135389 
               A135390
%K A135387 nonn,tabl
%O A135387 1,1
%A A135387 Gary W. Adamson (qntmpkt(AT)yahoo.com), Dec 09 2007