OFFSET
1,4
FORMULA
G.f.: (x-1)/((x^5+2*x^3+x)*y+x-1).
EXAMPLE
1;
1, 1;
3, 2, 1;
3, 7, 3, 1;
4, 12, 12, 4, 1;
4, 23, 28, 18, 5, 1;
PROG
(Maxima)
T(n, k):=sum(binomial(2*k, i)*binomial(n-2*i-1, k-1), i, 0, (n-k)/2);
(PARI) T(n, k)=sum(i=0, (n-k)\2, binomial(2*k, i)*binomial(n-2*i-1, k-1)) \\ Charles R Greathouse IV, Apr 30 2015
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Vladimir Kruchinin, Apr 29 2015
STATUS
approved