OFFSET
0,1
FORMULA
Sum_{k=0..n} T(n,k)*x^(n-k) = A135528(n+1), A000012(n), A040001(n), A153284(n+1) for x = 0,1,2,3 respectively.
G.f.: (1+y*x+(y-y^2)*x^2)/(1-y^2*x^2). - Philippe Deléham, Dec 17 2011
Sum_{k=0..n} T(n,k)*x^k = A000007(n), A000012(n), A158302(n) for x = 0, 1, 2 respectively. - Philippe Deléham, Dec 17 2011
EXAMPLE
Triangle begins:
1;
0, 1;
0, 1, 0;
0, 0, 0, 1;
0, 0, 0, 1, 0;
0, 0, 0, 0, 0, 1; ...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Philippe Deléham, Jan 08 2009
STATUS
approved