OFFSET
0,3
COMMENTS
FORMULA
a(q,n) = Sum_{i=0..n} 4^i*binomial(2n-2i+q, n-i).
EXAMPLE
Array starts:
1, 6, 30, 140, 630, ...
1, 7, 38, 187, 874, ...
1, 8, 47, 244, 1186, ...
1, 9, 57, 312, 1578, ...
...
MAPLE
a:=proc(q, n) options operator, arrow: sum(4^i*binomial(2*n-2*i+q, n-i), i= 0.. n) end proc: aa:=proc(q, n) options operator, arrow: a(q-1, n-1) end proc: matrix(10, 10, aa); # yields sequence in matrix form
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Emeric Deutsch, Jul 24 2008
STATUS
approved