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A166147 4n^2 + 4n - 7. 1
1, 17, 41, 73, 113, 161, 217, 281, 353, 433, 521, 617, 721, 833, 953, 1081, 1217, 1361, 1513, 1673, 1841, 2017, 2201, 2393, 2593, 2801, 3017, 3241, 3473, 3713, 3961, 4217, 4481, 4753, 5033, 5321, 5617, 5921, 6233, 6553, 6881, 7217, 7561, 7913, 8273, 8641 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

Index to sequences with linear recurrences with constant coefficients, signature (3,-3,1).

FORMULA

a(n)=a(n-1)+8n (with a(1)=1).

PROG

(PARI) a(n)=8*binomial(n+1, 2)-7 \\ Charles R Greathouse IV, Jan 11 2012

CROSSREFS

Sequence in context: A007519 A163185 A138005 * A028886 A146443 A110226

Adjacent sequences:  A166144 A166145 A166146 * A166148 A166149 A166150

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 08 2009

EXTENSIONS

New name from Charles R Greathouse IV, Jan 11 2012 based on Paolo P. Lava formula

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Last modified February 16 02:30 EST 2012. Contains 205860 sequences.