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A167541
a(n) = -(n - 4)*(n - 5)*(n - 12)/6.
4
2, 5, 8, 10, 10, 7, 0, -12, -30, -55, -88, -130, -182, -245, -320, -408, -510, -627, -760, -910, -1078, -1265, -1472, -1700, -1950, -2223, -2520, -2842, -3190, -3565, -3968, -4400, -4862, -5355, -5880, -6438, -7030, -7657, -8320, -9020, -9758, -10535, -11352
OFFSET
6,1
COMMENTS
Essentially the same as A111396.
The coefficient of x^(n-6) of the Polynomial B_n(x) defined in A135929.
FORMULA
a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4).
G.f.: x^6*(2 - 3*x)/(x - 1)^4.
a(n) = -A111396(n-12) for n > 11. - Bruno Berselli, Oct 02 2018
MATHEMATICA
LinearRecurrence[{4, -6, 4, -1}, {2, 5, 8, 10}, 50] (* Harvey P. Dale, May 27 2012 *)
CROSSREFS
Sequence in context: A068702 A083724 A072476 * A078345 A161817 A080228
KEYWORD
sign,easy
AUTHOR
Jamel Ghanouchi, Nov 06 2009
EXTENSIONS
Minor edits by N. J. A. Sloane, Nov 09 2009
Definition simplified, sequence extended by R. J. Mathar, Nov 12 2009
STATUS
approved