OFFSET
0,4
COMMENTS
Triangle T(n,k), 0 <= k <= n, read by rows, given by [1, 3, 0, 0, 0, 0, 0, 0, 0, ...] DELTA [1, 3, 0, 0, 0, 0, 0, 0, 0, ...] where DELTA is the operator defined in A084938. - Philippe Deléham, Aug 10 2005
LINKS
FORMULA
a(n,k) = 4^(n-1)*C(n, k), for n>0.
G.f.: (-1+3*x+3*x*y)/(-1+4*x+4*x*y). - R. J. Mathar, Aug 12 2015
EXAMPLE
1;
1, 1;
4, 8, 4;
16, 48, 48, 16;
64, 256, 384, 256, 64; ...
CROSSREFS
KEYWORD
AUTHOR
Christian G. Bower, May 16 2000
STATUS
approved