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A087329
Independence numbers for KT_4 knight on hexagonal board.
3
1, 3, 3, 4, 7, 9, 12, 15, 19, 22, 25, 28, 37, 40, 46, 51, 61, 66, 71, 76, 91, 96, 103, 111, 127
OFFSET
1,2
LINKS
J.-P. Bode and H. Harborth, Independence for knights on hexagon and triangle boards, Discrete Math., 272 (2003), 27-35.
Andy Huchala, Python program.
FORMULA
a(4*n+1) = 3*n^2 + 3*n + 1 = A003215(n) from Bode and Harborth. - Andy Huchala, Mar 16 2024
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Oct 21 2003
EXTENSIONS
a(17)-a(25) from Andy Huchala, Mar 16 2024
STATUS
approved