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4, 25, 64, 121, 196, 289, 400, 529, 676, 841, 1024, 1225, 1444, 1681, 1936, 2209, 2500, 2809, 3136, 3481, 3844, 4225, 4624, 5041, 5476, 5929, 6400, 6889, 7396, 7921, 8464, 9025, 9604, 10201, 10816, 11449
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| If Y is a fixed 2-subset of a (3n+1)-set X then a(n-1) is the number of 3-subsets of X intersecting Y. - Milan R. Janjic (agnus(AT)blic.net), Oct 21 2007
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..3000
Milan Janjic, Two Enumerative Functions
Index entries for sequences related to linear recurrences with constant coefficients, signature (3,-3,1).
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FORMULA
| a(n) = A016958(n)/4 [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 30 2009]
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PROG
| (MAGMA) [(3*n+2)^2: n in [0..50]]; // Vincenzo Librandi, May 06 2011
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CROSSREFS
| A016957, A016958 [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 30 2009]
Sequence in context: A089767 A135784 A131069 * A065733 A077205 A180569
Adjacent sequences: A016787 A016788 A016789 * A016791 A016792 A016793
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Notation in formula cleaned up - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 05 2010
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