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Search: id:A161532
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| 1, 11, 25, 43, 65, 91, 121, 155, 193, 235, 281, 331, 385, 443, 505, 571, 641, 715, 793, 875, 961, 1051, 1145, 1243, 1345, 1451, 1561, 1675, 1793, 1915, 2041, 2171, 2305, 2443, 2585, 2731, 2881, 3035, 3193, 3355, 3521, 3691, 3865, 4043, 4225, 4411, 4601
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Evolution of surface in two directions
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LINKS
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Pierre Gayet, Table of n, a(n) for n = 1..10000
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FORMULA
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a(n)=4*n+a(n-1)+2 (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+2=11; n=3, a(3)=4*3+11+2=25; n=4, a(4)=4*4+25+2=43 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 09 2009]
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MATHEMATICA
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lst={}; Do[a=2*n^2+8*n+1; AppendTo[lst, a], {n, 0, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Jun 13 2009]
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CROSSREFS
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Sequence in context: A125868 A031025 A140675 this_sequence A118648 A105270 A039337
Adjacent sequences: A161529 A161530 A161531 this_sequence A161533 A161534 A161535
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KEYWORD
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easy,nonn,new
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AUTHOR
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Pierre Gayet (gayet.pierre(AT)wanadoo.fr), Jun 13 2009
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EXTENSIONS
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Added more terms and Mathematica program Vladimir Orlovsky (4vladimir(AT)gmail.com), Jun 13 2009
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