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Search: id:A115523
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| A115523 |
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Number of ordered quadruples (i,j,k,l) in range [0..n] satisfying i == j mod 2, j == k mod 3 and k == l mod 4. |
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+0
2
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| 1, 2, 5, 12, 33, 60, 111, 176, 287, 440, 637, 864, 1237, 1652, 2147, 2752, 3555, 4428, 5517, 6700, 8177, 9878, 11785, 13824, 16441, 19214, 22265, 25676, 29685, 33900, 38715, 43776, 49595, 55964, 62821, 69984, 78445, 87248, 96647, 106800, 118167, 129948, 142905, 156332
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n) = binomial(n+1,4) - presumably quadratic (PORC) correction term which depends on n mod 24.
Actually for this one I would like to see an explicit formula for a(n).
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CROSSREFS
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Cf. A115520.
Sequence in context: A076822 A143657 A014326 this_sequence A010843 A084075 A000560
Adjacent sequences: A115520 A115521 A115522 this_sequence A115524 A115525 A115526
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KEYWORD
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nonn
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AUTHOR
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njas and Vinay Vaishampayan (vinay(AT)research.att.com), Mar 09 2006
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