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 A348229 Coordination sequence for Wilkinson's 123-circle packing with respect to a circle of radius 2. 3
 1, 6, 16, 24, 38, 40, 58, 56, 78, 72, 98, 88, 118, 104, 138, 120, 158, 136, 178, 152, 198, 168, 218, 184, 238, 200, 258, 216, 278, 232, 298, 248, 318, 264, 338, 280, 358, 296, 378, 312, 398, 328, 418, 344, 438, 360, 458, 376, 478, 392, 498, 408, 518, 424, 538 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS See A348227 for much more information about this structure. LINKS Table of n, a(n) for n=0..54. Rémy Sigrist, PARI program for A348229 FORMULA 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.] PROG (PARI) See Links section. CROSSREFS Cf. A348227-A348239. Sequence in context: A034053 A199988 A114222 * A275641 A171440 A031220 Adjacent sequences: A348226 A348227 A348228 * A348230 A348231 A348232 KEYWORD nonn AUTHOR N. J. A. Sloane, Oct 08 2021 EXTENSIONS More terms from Rémy Sigrist, Oct 09 2021 STATUS approved

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Last modified November 29 03:03 EST 2023. Contains 367422 sequences. (Running on oeis4.)