OFFSET
0,3
COMMENTS
Central terms of triangle A123603.
EXAMPLE
Triangle A123603 of coefficients of x^(n-k)*y^k in 1/(1 - x - y - x^2 + x*y - y^2), for n >= 0 and k = 0..n, begins
1;
1, 1;
2, 1, 2;
3, 3, 3, 3;
5, 5, 9, 5, 5;
8, 10, 17, 17, 10, 8;
13, 18, 36, 35, 36, 18, 13;
21, 33, 69, 81, 81, 69, 33, 21;
34, 59, 133, 167, 199, 167, 133, 59, 34;
55, 105, 249, 345, 435, 435, 345, 249, 105, 55;
89, 185, 462, 687, 945, 1005, 945, 687, 462, 185, 89; ...
in which the central terms form this sequence.
PROG
(PARI) {a(n) = polcoeff( polcoeff( 1/(1 - x - y - x^2 + x*y - y^2 +x*O(x^n) +y*O(y^n)), n, x), n, y)}
for(n=0, 30, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Dec 12 2018
STATUS
approved