OFFSET
0,6
EXAMPLE
The triangle begins:
1;
0, 1;
-1, 0, 3;
0, -1, 4, 21;
1, -1, 5, 55, 209;
0, 0, 6, 144, 780, 2640;
-1, 1, 7, 377, 2911, 12649, 40391;
0, 1, 8, 987, 10864, 60605, 235416, 726103
PROG
(PARI) chp(k, x) = if(k==0, 1, if(k==1, x, x*chp(k-1, x) - chp(k-2, x)));
for (k=0, 9, for(x=0, k, print1(ch(k, x), ", ")); print())
CROSSREFS
KEYWORD
sign,tabl
AUTHOR
Hugo Pfoertner, Oct 18 2022
STATUS
approved