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A087327
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Independence numbers for KT_2 knight on triangular board.
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2
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1, 2, 6, 8, 13, 18, 25, 32, 41, 50, 61, 72, 85, 98, 113, 128, 145, 162, 181, 200, 221, 242, 265, 288, 313, 338, 365, 392, 421, 450, 481, 512, 545, 578, 613, 648, 685, 722, 761, 800, 841, 882, 925, 968, 1013, 1058, 1105, 1152, 1201, 1250, 1301, 1352, 1405, 1458
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| J.-P. Bode and H. Harborth, Independence for knights on hexagon and triangle boards, Discrete Math., 272 (2003), 27-35.
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FORMULA
| a(n) = ceiling(n^2/2) except for n=3.
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CROSSREFS
| Cf. A087328, A087329.
Sequence in context: A186703 A054248 A038108 * A002511 A074383 A107505
Adjacent sequences: A087324 A087325 A087326 * A087328 A087329 A087330
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Oct 21 2003
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), May 06 2005
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