A047876 a(n) = Sum{T(i,n-i): i=0,1,...,n}, array T as in A049604.

0, 6, 8, 8, 12, 18, 22, 28, 36, 42, 52, 64, 68, 82, 98, 104, 118, 138, 146, 164, 184, 194, 216, 240, 248, 274, 302, 312, 338, 370, 382, 412, 444, 458, 492, 528, 540, 578, 618, 632, 670, 714, 730, 772, 816, 834, 880, 928, 944, 994, 1046

Offset

0,2

Links

Table of n, a(n) for n=0..50.

Formula

From Chai Wah Wu, Jun 11 2016: (Start)

a(n) = 2*a(n-3) + a(n-4) - a(n-6) - 2*a(n-7) + a(n-10) for n > 14 (conjectured).

G.f.: 2*x*(x^13 + x^11 - x^9 - 2*x^8 - 4*x^7 - x^6 + x^5 + 2*x^4 - 4*x^2 - 4*x - 3)/(x^10 - 2*x^7 - x^6 + x^4 + 2*x^3 - 1) (conjectured). (End)

Crossrefs

Sequence in context: A185200 A216275 A315946 * A315947 A315948 A315949

Adjacent sequences: A047873 A047874 A047875 * A047877 A047878 A047879

Keyword

nonn

Author

Clark Kimberling

Status

approved