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Search: id:A087327
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| A087327 |
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Independence numbers for KT_2 knight on triangular board. |
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+0
3
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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; listen)
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OFFSET
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1,2
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REFERENCES
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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
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a(n) = ceiling(n^2/2) except for n=3.
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CROSSREFS
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Cf. A087328, A087329.
Sequence in context: A030457 A054248 A038108 this_sequence A002511 A074383 A107505
Adjacent sequences: A087324 A087325 A087326 this_sequence A087328 A087329 A087330
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Oct 21 2003
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EXTENSIONS
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More terms from David Wasserman (wasserma(AT)spawar.navy.mil), May 06 2005
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