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Search: id:A125202
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| -1, 5, 19, 41, 71, 109, 155, 209, 271, 341, 419, 505, 599, 701, 811, 929, 1055, 1189, 1331, 1481, 1639, 1805, 1979, 2161, 2351, 2549, 2755, 2969, 3191, 3421, 3659, 3905, 4159, 4421, 4691, 4969, 5255, 5549, 5851, 6161, 6479, 6805, 7139, 7481, 7831, 8189, 8555, 8929, 9311, 9701, 10099, 10505, 10919, 11341
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(n) = A125199(n,n-1) for n>1;
A003415(a(n)) = A017089(n-1).
Also, a(n)=4*n^2+2*n-1: example: for n=2, a(2)=19; n=40, a(40)=6479 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 26 2009]
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MATHEMATICA
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f[a_]:=4*a^2-6*a+1; lst={}; Do[AppendTo[lst, f[n]], {n, 0, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Jul 14 2009]
f[a_]:=4*a^2-6*a+1; lst={}; Do[AppendTo[lst, f[n]], {n, 0, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Jul 14 2009]
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CROSSREFS
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Cf. A002939, A016789, A017041, A017485.
Sequence in context: A129828 A146600 A031379 this_sequence A024841 A155737 A140761
Adjacent sequences: A125199 A125200 A125201 this_sequence A125203 A125204 A125205
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KEYWORD
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sign
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 24 2006
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