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 A046023 Number of ways to color edges of a tetrahedron using <= n colors. 6
 0, 1, 12, 87, 416, 1475, 4236, 10437, 22912, 45981, 85900, 151371, 254112, 409487, 637196, 962025, 1414656, 2032537, 2860812, 3953311, 5373600, 7196091, 9507212, 12406637, 16008576, 20443125, 25857676, 32418387, 40311712 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..10000 Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1). FORMULA a(n) = (n^6+3*n^4+8*n^2)/12. G.f.: x*(1+x)*(1+4*x+20*x^2+4*x^3+x^4)/(1-x)^7. - Colin Barker, Jan 30 2012 MAPLE A046023 := n->(n^6+3*n^4+8*n^2)/12; MATHEMATICA LinearRecurrence[{7, -21, 35, -35, 21, -7, 1}, {0, 1, 12, 87, 416, 1475, 4236}, 30] (* Vincenzo Librandi, Jan 31 2012 *) PROG (PARI) a(n)=(n^6+3*n^4+8*n^2)/12 \\ Charles R Greathouse IV, Jan 31 2012 CROSSREFS Cf. A006008. Row 3 of A327083. Sequence in context: A283119 A091119 A243248 * A183721 A180797 A137207 Adjacent sequences:  A046020 A046021 A046022 * A046024 A046025 A046026 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, Apr 11 2001 STATUS approved

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Last modified October 13 18:57 EDT 2019. Contains 327981 sequences. (Running on oeis4.)