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Search: id:A136392
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| A136392 |
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a(n) = n*(3n-2) + (n-1)*(3n-5), n>1. |
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+0
2
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| 1, 9, 29, 61, 105, 161, 229, 309, 401, 505, 621, 749, 889, 1041
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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A016777 = (3n+1) with offset 0, but (3n-2) with offset 1, = 1, 4, 7, 10, 13,...
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FORMULA
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a(n) = n*(3n-2) + (n-1)*(3n-5), n>1 a(n) = n*A016777(n-1) + (n-1)*A016777(n-2). Binomial transform of [1, 8, 12, 0, 0, 0,...].
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EXAMPLE
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a(5) = 105 = n*(3n-2) + (n-1)*(3n-5) = 5*13 + 4*10 = 65 + 40.
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CROSSREFS
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Cf. A016777.
Adjacent sequences: A136389 A136390 A136391 this_sequence A136393 A136394 A136395
Sequence in context: A031296 A146869 A129397 this_sequence A055195 A024922 A045862
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KEYWORD
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nonn
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Dec 28 2007
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