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Search: id:A161617
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| 1, 29, 73, 133, 209, 301, 409, 533, 673, 829, 1001, 1189, 1393, 1613, 1849, 2101, 2369, 2653, 2953, 3269, 3601, 3949, 4313, 4693, 5089, 5501, 5929, 6373, 6833, 7309, 7801, 8309, 8833, 9373, 9929, 10501, 11089, 11693
(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=0..9999
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FORMULA
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a(n)=16*n+a(n-1)-4 (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)=16*2+1-4=29; n=3, a(3)=16*3+29-4=73; n=4, a(4)=16*4+73-4=133 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 16 2009]
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CROSSREFS
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Sequence in context: A099775 A139893 A063312 this_sequence A142305 A071110 A044167
Adjacent sequences: A161614 A161615 A161616 this_sequence A161618 A161619 A161620
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KEYWORD
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easy,nonn
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AUTHOR
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Pierre Gayet (gayt.pierre(AT)wanadoo.fr), Jun 14 2009
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