A168308 The fifth left hand column of triangle A167591.

525, 12396, 162740, 1537216, 11589216, 73898880, 413745024, 2087500800, 9672309504, 41745859584, 169680276480, 655126331392, 2419298385920, 8593269522432, 29494166618112, 98195558891520, 318148898783232, 1005877391523840, 3110695891894272

Offset

5,1

Links

G. C. Greubel, Table of n, a(n) for n = 5..1000

Index entries for linear recurrences with constant coefficients, signature (20, -180, 960, -3360, 8064, -13440, 15360, -11520, 5120, -1024).

Formula

a(n) = 2^n*(107*n^9 - 1824*n^8 + 14124*n^7 - 62538*n^6 + 165228*n^5 - 259476*n^4 + 241561*n^3 - 133542*n^2 + 36360*n)/241920.

G.f.: (1936*z^4 + 9696*z^3 + 9320*z^2 + 1896*z + 525)/(1-2*z)^10.

a(n) = 20*a(n-1) - 180*a(n-2) + 960*a(n-3) - 3360*a(n-4) + 8064*a(n-5) - 13440*a(n-6) + 15360*a(n-7) - 11520*a(n-8) + 5120*a(n-9) - 1024*a(n-10).

a(n) - 19*a(n-1) + 162*a(n-2) - 816*a(n-3) + 2688*a(n-4) - 6048*a(n-5) + 9408*a(n-6) -9984*a(n-7) + 6912*a(n-8) - 2816*a(n-9) + 512*a(n-10) = 321*2^(n-2).

Mathematica

LinearRecurrence[{20, -180, 960, -3360, 8064, -13440, 15360, -11520, 5120, -1024}, {525, 12396, 162740, 1537216, 11589216, 73898880, 413745024, 2087500800, 9672309504, 41745859584}, 50] (* G. C. Greubel, Jul 17 2016 *)

Prog

(Magma) [2^n*(107*n^9-1824*n^8+14124*n^7-62538*n^6+ 165228*n^5-259476*n^4+241561*n^3-133542*n^2+ 36360*n)/241920: n in [5..30]]; // Vincenzo Librandi, Jul 18 2016

Crossrefs

Equals the fifth left hand column of triangle A167591.

Other left hand columns are A001787, A167592, A167593 and A168307.

Sequence in context: A284961 A217742 A204692 * A294984 A020379 A251022

Adjacent sequences: A168305 A168306 A168307 * A168309 A168310 A168311

Keyword

easy,nonn

Author

Johannes W. Meijer, Nov 23 2009

Status

approved