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A162257 a(n) = (2*n^3 + 5*n^2 - 11*n)/2. 1
-2, 7, 33, 82, 160, 273, 427, 628, 882, 1195, 1573, 2022, 2548, 3157, 3855, 4648, 5542, 6543, 7657, 8890, 10248, 11737, 13363, 15132, 17050, 19123, 21357, 23758, 26332, 29085, 32023, 35152, 38478, 42007, 45745, 49698, 53872, 58273, 62907, 67780 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
Row sums from A155550: a(n) = Sum_{m=1..n} 2*m*n + m + n - 6.
From Vincenzo Librandi, Mar 04 2012: (Start)
G.f.: x*(-2 + 15*x - 7*x^2)/(1-x)^4.
a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4). (End)
MAPLE
A162257:=n->(2*n^3+5*n^2-11*n)/2: seq(A162257(n), n=1..80); # Wesley Ivan Hurt, Jan 30 2017
MATHEMATICA
CoefficientList[Series[(-2+15*x-7*x^2)/(1-x)^4, {x, 0, 40}], x] (* or *) LinearRecurrence[{4, -6, 4, -1}, {-2, 7, 33, 82}, 50] (* Vincenzo Librandi, Mar 04 2012 *)
CROSSREFS
Cf. A155550.
Sequence in context: A348105 A067551 A080119 * A214954 A366237 A369269
KEYWORD
sign,easy
AUTHOR
Vincenzo Librandi, Jun 29 2009
EXTENSIONS
New name from Vincenzo Librandi, Mar 04 2012
STATUS
approved

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Last modified March 19 06:52 EDT 2024. Contains 370953 sequences. (Running on oeis4.)