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A049625
Congruent to 1, 2, 4, 6, 8 or 9 mod 11, but with 2 instead of 1.
1
2, 2, 4, 6, 8, 9, 12, 13, 15, 17, 19, 20, 23, 24, 26, 28, 30, 31, 34, 35, 37, 39, 41, 42, 45, 46, 48, 50, 52, 53, 56, 57, 59, 61, 63, 64, 67, 68, 70, 72, 74, 75, 78, 79, 81, 83, 85, 86, 89, 90, 92, 94, 96, 97, 100, 101, 103, 105, 107, 108, 111, 112, 114, 116, 118, 119, 122, 123, 125
OFFSET
0,1
COMMENTS
a(n) = T(n, 3), array T as in A049615.
FORMULA
G.f.: 2 -x*(-2-4*x-4*x^2-2*x^3+x^4)/( (1+x)*(1+x+x^2)*(x-1)^2 ). - R. J. Mathar, Oct 26 2015
MATHEMATICA
CoefficientList[Series[2 - x*(-2 - 4*x - 4*x^2 - 2*x^3 + x^4)/((1 + x)*(1 + x + x^2)*(x - 1)^2), {x, 0, 30}], x] (* G. C. Greubel, Dec 15 2017 *)
PROG
(PARI) x='x+O('x^30); Vec(2 -x*(-2-4*x-4*x^2-2*x^3+x^4)/( (1+x)*(1+x+x^2)*(x-1)^2 )) \\ G. C. Greubel, Dec 15 2017
CROSSREFS
Sequence in context: A176528 A108891 A147570 * A202102 A300576 A118303
KEYWORD
nonn,easy
EXTENSIONS
Terms a(38) onward added by G. C. Greubel, Dec 15 2017
STATUS
approved