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Search: id:A130883
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| 1, 2, 7, 16, 29, 46, 67, 92, 121, 154, 191, 232, 277, 326, 379, 436, 497, 562, 631, 704, 781, 862, 947, 1036, 1129, 1226, 1327, 1432, 1541, 1654, 1771, 1892, 2017, 2146, 2279, 2416, 2557, 2702, 2851, 3004, 3161, 3322, 3487, 3656, 3829
(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)=4*n+a(n-1)-7 (with a(1)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 09 2009]
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EXAMPLE
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For n=2, a(2)=4*2+1-7=2; n=3, a(3)=4*3+2-7=7; n=4, a(4)=4*4+7-7=16 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 09 2009]
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MATHEMATICA
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a[n_]:=2*n^2-n+1; ...and/or...Array[ -#*(1-#*2)+1&, 5!, 0] [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 21 2008]
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CROSSREFS
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Cf. A084849.
Sequence in context: A048231 A070169 A162420 this_sequence A005581 A064468 A074470
Adjacent sequences: A130880 A130881 A130882 this_sequence A130884 A130885 A130886
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KEYWORD
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nonn
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AUTHOR
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Mohammad K. Azarian (azarian(AT)evansville.edu), Jul 26 2007
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