[go: up one dir, main page]

login
Partial sums of A307201.
7

%I #13 Apr 04 2019 14:33:06

%S 1,4,13,25,46,76,106,139,181,238,289,343,406,490,562,637,721,832,925,

%T 1021,1126,1264,1378,1495,1621,1786,1921,2059,2206,2398,2554,2713,

%U 2881,3100,3277,3457,3646,3892,4090,4291,4501,4774,4993,5215,5446,5746,5986,6229

%N Partial sums of A307201.

%C Computed by _Davide M. Proserpio_ using ToposPro, Apr 01 2019

%H Rémy Sigrist, <a href="/A307271/b307271.txt">Table of n, a(n) for n = 0..1000</a>

%F Conjectures from _Colin Barker_, Apr 04 2019: (Start)

%F G.f.: (1 + 3*x + 9*x^2 + 12*x^3 + 19*x^4 + 24*x^5 + 12*x^6 + 9*x^7 + x^8) / ((1 - x)^3*(1 + x)^2*(1 + x^2)^2).

%F a(n) = a(n-1) + 2*a(n-4) - 2*a(n-5) - a(n-8) + a(n-9) for n>8.

%F (End)

%Y Cf. A307201.

%K nonn

%O 0,2

%A _N. J. A. Sloane_, Apr 02 2019

%E More terms from _Rémy Sigrist_, Apr 04 2019