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A063489 a(n) = (2*n-1)*(5*n^2-5*n+6)/6. 64

%I

%S 1,8,30,77,159,286,468,715,1037,1444,1946,2553,3275,4122,5104,6231,

%T 7513,8960,10582,12389,14391,16598,19020,21667,24549,27676,31058,

%U 34705,38627,42834,47336,52143,57265,62712,68494,74621,81103,87950

%N a(n) = (2*n-1)*(5*n^2-5*n+6)/6.

%H Harry J. Smith, <a href="/A063489/b063489.txt">Table of n, a(n) for n = 1..1000</a>

%H T. P. Martin, <a href="http://dx.doi.org/10.1016/0370-1573(95)00083-6">Shells of atoms</a>, Phys. Rep., 273 (1996), 199-241, eq. (10).

%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (4, -6, 4, -1).

%F G.f.: x*(1+x)*(1+3*x+x^2)/(1-x)^4. - _Colin Barker_, Mar 02 2012

%F a(n) = 4*a(n-1) -6*a(n-2) +4*a(n-3) -a(n-4), with a(1)=1, a(2)=8, a(3)=30, a(4)=77. - _Harvey P. Dale_, Aug 20 2012

%F E.g.f.: (-6 + 12*x + 15*x^2 + 10*x^3)*exp(x)/6 + 1. - _G. C. Greubel_, Dec 01 2017

%t Table[(2n-1)(5n^2-5n+6)/6,{n,40}] (* or *) LinearRecurrence[{4,-6,4,-1},{1,8,30,77},40] (* _Harvey P. Dale_, Aug 20 2012 *)

%o (PARI) { for (n=1, 1000, write("b063489.txt", n, " ", (2*n - 1)*(5*n^2 - 5*n + 6)/6) ) } \\ _Harry J. Smith_, Aug 23 2009

%o (MAGMA) [(2*n-1)*(5*n^2-5*n+6)/6: n in [1..30]]; // _G. C. Greubel_, Dec 01 2017

%o (PARI) x='x+O('x^30); Vec(serlaplace((-6 + 12*x + 15*x^2 + 10*x^3 )*exp(x)/6 + 1)) \\ _G. C. Greubel_, Dec 01 2017

%Y 1/12*t*(2*n^3-3*n^2+n)+2*n-1 for t = 2, 4, 6, ... gives A049480, A005894, A063488, A001845, A063489, A005898, A063490, A057813, A063491, A005902, A063492, A005917, A063493, A063494, A063495, A063496.

%Y Partial sums of A010001.

%Y The 28 uniform 3D tilings: cab: A299266, A299267; crs: A299268, A299269; fcu: A005901, A005902; fee: A299259, A299265; flu-e: A299272, A299273; fst: A299258, A299264; hal: A299274, A299275; hcp: A007899, A007202; hex: A005897, A005898; kag: A299256, A299262; lta: A008137, A299276; pcu: A005899, A001845; pcu-i: A299277, A299278; reo: A299279, A299280; reo-e: A299281, A299282; rho: A008137, A299276; sod: A005893, A005894; sve: A299255, A299261; svh: A299283, A299284; svj: A299254, A299260; svk: A010001, A063489; tca: A299285, A299286; tcd: A299287, A299288; tfs: A005899, A001845; tsi: A299289, A299290; ttw: A299257, A299263; ubt: A299291, A299292; bnn: A007899, A007202. See the Proserpio link in A299266 for overview.

%K nonn,easy

%O 1,2

%A _N. J. A. Sloane_, Aug 01 2001

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Last modified December 9 22:27 EST 2019. Contains 329880 sequences. (Running on oeis4.)