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A082873
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Independence number of king KG_2 on triangle board B_n.
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1
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1, 1, 3, 6, 8, 12, 15, 19, 25, 30, 36, 42, 49, 55, 63, 72, 80, 90, 99, 109, 121, 132, 144, 156, 169, 181, 195, 210, 224, 240, 255, 271, 289, 306, 324, 342, 361, 379, 399, 420, 440, 462, 483, 505, 529, 552, 576, 600, 625, 649, 675, 702, 728
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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REFERENCES
| J.-J. Bode, H. Harborth and M. Harborth, King independence on triangle boards, Discr. Math., 266 (2003), 101-107.
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FORMULA
| a(n) = floor((n+1)^2/4) if n == 0, 1, 4, 6, 9, 10, 11 (mod 12), a(n) = floor((n+1)^2/4) - 1 otherwise.
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CROSSREFS
| Cf. A082874.
Sequence in context: A077024 A185549 A185597 * A182727 A006048 A049827
Adjacent sequences: A082870 A082871 A082872 * A082874 A082875 A082876
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), May 25 2003
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EXTENSIONS
| More terms from Sean A. Irvine (sairvin(AT)xtra.co.nz), Sep 26 2011
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