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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, 12313, 12949, 13601
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| The defining formula can be regarded as an approximation and simplification of the expansion / propagation of native hydrophytes on the surface of stagnant waters in orthogonal directions; absence of competition / concurrence and of retrogression is assumed, mortality is taken into account. - (Translation of a comment in French sent by P. Gayet)
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LINKS
| Pierre GAYET, Table of n, a(n) for n=0..9999
Pierre Gayet, Note et Compte rendu (gif version)
Pierre Gayet, Note et Compte Rendu (pdf version)
Pierre Gayet, 98 séquences générées ... par la formule générale indiquée
Claude Monet, Nymphéas
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FORMULA
| a(n) = a(n-1)+16*n+12 (with a(0)=1). [From Vincenzo Librandi, Nov 30 2010]
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PROG
| (MAGMA) [ 8*n^2+20*n+1: n in [0..50] ];
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CROSSREFS
| Cf. A161532, A161549, A161587, A161935, A162316.
Sequence in context: A099775 A139893 A063312 * A142305 A184072 A071110
Adjacent sequences: A161614 A161615 A161616 * A161618 A161619 A161620
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KEYWORD
| easy,nonn
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AUTHOR
| Pierre Gayet (gayt.pierre(AT)wanadoo.fr), Jun 14 2009
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