OFFSET
1,2
FORMULA
Narayana transform (A001263) of the triangular series. - Gary W. Adamson, Jul 29 2011
EXAMPLE
a(4) = 65 = sum of row 4 terms of triangle A132819: (1 + 18 + 36 + 10).
a(4) = 65 = (1, 6, 6, 1) dot (1, 3, 6, 10) = (1 + 18 + 36 + 10).
MAPLE
A001263 := proc(n, k)
if n <1 or k < 1 or k > n then
0;
else
binomial(n-1, k-1)*binomial(n, k-1)/k ;
end if;
end proc:
A132820 := proc(n)
end proc: # R. J. Mathar, Apr 04 2012
CROSSREFS
KEYWORD
nonn
AUTHOR
Gary W. Adamson, Sep 02 2007
STATUS
approved