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A301687 Partial sums of A301686. 0

%I

%S 1,6,13,27,44,63,91,120,151,193,234,277,333,386,441,511,576,643,727,

%T 804,883,981,1070,1161,1273,1374,1477,1603,1716,1831,1971,2096,2223,

%U 2377,2514,2653,2821,2970,3121,3303,3464,3627,3823,3996,4171,4381,4566,4753,4977,5174,5373,5611,5820,6031,6283,6504,6727,6993,7226,7461,7741

%N Partial sums of A301686.

%F Conjectures from _Chai Wah Wu_, Feb 03 2021: (Start)

%F a(n) = a(n-1) + 2*a(n-3) - 2*a(n-4) - a(n-6) + a(n-7) for n > 6.

%F G.f.: (-x^6 - 5*x^5 - 7*x^4 - 12*x^3 - 7*x^2 - 5*x - 1)/((x - 1)^3*(x^2 + x + 1)^2). (End)

%Y Cf. A301686.

%K nonn

%O 0,2

%A _N. J. A. Sloane_, Mar 25 2018

%E More terms could now be added from A301686. - _N. J. A. Sloane_, Mar 29 2018

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Last modified September 25 04:20 EDT 2021. Contains 347652 sequences. (Running on oeis4.)