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A025776
Expansion of 1/((1-x)(1-x^5)(1-x^6)).
0
1, 1, 1, 1, 1, 2, 3, 3, 3, 3, 4, 5, 6, 6, 6, 7, 8, 9, 10, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 28, 30, 31, 32, 33, 35, 37, 39, 40, 41, 43, 45, 47, 49, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70
OFFSET
0,6
FORMULA
a(n)= +a(n-1) +a(n-5) -a(n-7) -a(n-11) +a(n-12). - R. J. Mathar, Aug 21 2014
MATHEMATICA
CoefficientList[Series[1/((1-x)(1-x^5)(1-x^6)), {x, 0, 60}], x] (* Harvey P. Dale, Mar 06 2011 *)
LinearRecurrence[{1, 0, 0, 0, 1, 0, -1, 0, 0, 0, -1, 1}, {1, 1, 1, 1, 1, 2, 3, 3, 3, 3, 4, 5}, 70] (* Harvey P. Dale, Feb 09 2015 *)
CROSSREFS
Sequence in context: A176001 A194272 A285764 * A120505 A029109 A257998
KEYWORD
nonn,easy
STATUS
approved