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Search: id:A158186
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| 1, 4, 27, 70, 133, 216, 319, 442, 585, 748, 931, 1134, 1357, 1600, 1863, 2146, 2449, 2772, 3115, 3478, 3861, 4264, 4687, 5130, 5593, 6076, 6579, 7102, 7645, 8208, 8791, 9394, 10017, 10660, 11323, 12006, 12709, 13432, 14175, 14938, 15721, 16524, 17347
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OFFSET
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0,2
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COMMENT
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a(n) = A033571(n) - A008596(n) = A010010(n) - A033571(n).
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FORMULA
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a(n) = (2*n-1)*(5*n-1).
G.f.: (1+x+18*x^2)/(1-x)^3 [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Mar 27 2009]
a(n)=20*n+a(n-1)-37 (with a(1)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 16 2009]
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EXAMPLE
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For n=2, a(2)=20*2+1-37=4; n=3, a(3)=20*3+4-37=27; n=4, a(4)=20*4+27-37=70 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 16 2009]
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KEYWORD
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nonn,new
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 13 2009
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EXTENSIONS
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Typo in definition corrected by Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 03 2009
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