OFFSET
0,2
LINKS
Allan J. MacLeod, Knight's Problem
PROG
(PARI) {a(n) = my(k=1); while(ellanalyticrank(ellinit([0, k^2+6*k-3, 0, -16*k, 0]))[1]<>n, k++); k}
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Seiichi Manyama, Jul 14 2019
STATUS
approved