A087329 Independence numbers for KT_4 knight on hexagonal board.

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

Table of n, a(n) for n=1..25.

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

Cf. A003215, A087327, A087328.

Sequence in context: A050066 A050064 A137894 * A298914 A205116 A011959

Adjacent sequences: A087326 A087327 A087328 * A087330 A087331 A087332

Keyword

nonn,more

Author

N. J. A. Sloane, Oct 21 2003

Extensions

a(17)-a(25) from Andy Huchala, Mar 16 2024

Status

approved