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A348229 Coordination sequence for Wilkinson's 123-circle packing with respect to a circle of radius 2. 3

%I #27 Sep 21 2022 02:59:13

%S 1,6,16,24,38,40,58,56,78,72,98,88,118,104,138,120,158,136,178,152,

%T 198,168,218,184,238,200,258,216,278,232,298,248,318,264,338,280,358,

%U 296,378,312,398,328,418,344,438,360,458,376,478,392,498,408,518,424,538

%N Coordination sequence for Wilkinson's 123-circle packing with respect to a circle of radius 2.

%C See A348227 for much more information about this structure.

%H Rémy Sigrist, <a href="/A348229/a348229.gp.txt">PARI program for A348229</a>

%F G.f. = (1 + 6*q + 14*q^2 + 12*q^3 + 7*q^4 - 2*q^5 - 2*q^6)/(1 - q^2)^2. [This has not yet been officially proved, but it will follow from the "coloring book" method in the same way that the g.f. for A348227 was established.]

%o (PARI) See Links section.

%Y Cf. A348227-A348239.

%K nonn

%O 0,2

%A _N. J. A. Sloane_, Oct 08 2021

%E More terms from _Rémy Sigrist_, Oct 09 2021

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Last modified February 26 17:57 EST 2024. Contains 370352 sequences. (Running on oeis4.)