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Search: id:A071239
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| 0, 1, 6, 22, 60, 135, 266, 476, 792, 1245, 1870, 2706, 3796, 5187, 6930, 9080, 11696, 14841, 18582, 22990, 28140, 34111, 40986, 48852, 57800, 67925, 79326, 92106, 106372, 122235, 139810, 159216, 180576, 204017, 229670, 257670, 288156, 321271, 357162, 395980
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Number of binary pattern classes with 4 black beads in the (2,n)-rectangular grid; two patterns are in the same class if one of them can be obtained by reflexion or rotation of the other one. [From Yosu Yurramendi (yosu.yurramendi(AT)ehu.es), Sep 12 2008]
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REFERENCES
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T. A. Gulliver, Sequences from Arrays of Integers, Int. Math. Journal, Vol. 1, No. 4, pp. 323-332, 2002.
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MAPLE
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a:=n->add(n+add(binomial(n, 2), j=2..n), j=2..n):seq(a(n)/3, n=1..40); [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Aug 26 2008]
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CROSSREFS
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Cf. A132390 [From Yosu Yurramendi (yosu.yurramendi(AT)ehu.es), Sep 12 2008]
Sequence in context: A081441 A127760 A066188 this_sequence A105450 A011888 A081282
Adjacent sequences: A071236 A071237 A071238 this_sequence A071240 A071241 A071242
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Jun 12 2002
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