A001594 a(n) = 6^n + n^6.

1, 7, 100, 945, 5392, 23401, 93312, 397585, 1941760, 10609137, 61466176, 364568617, 2179768320, 13065520825, 78371693632, 470196375201, 2821126684672, 16926683582305, 101559990680640, 609359787056377

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (13,-63,161,-245,231,-133,43,-6).

Formula

G.f.: (1 - 6*x + 72*x^2 - 75*x^3 - 1475*x^4 - 1776*x^5 - 334*x^6 - 7*x^7)/((1-x)^7*(1-6*x)). - Vincenzo Librandi, Aug 28 2014

Maple

seq(seq(k^n+n^k, k=6..6), n=0..19); # Zerinvary Lajos, Jun 29 2007

Mathematica

Table[6^n + n^6, {n, 0, 30}] (* or *) CoefficientList[Series[(1 - 6 x + 72 x^2 - 75 x^3 - 1475 x^4 - 1776 x^5 - 334 x^6 - 7 x^7)/((1-x)^7 (1-6 x)), {x, 0, 30}], x] (* Vincenzo Librandi, Aug 28 2014 *)
LinearRecurrence[{13, -63, 161, -245, 231, -133, 43, -6}, {1, 7, 100, 945, 5392, 23401, 93312, 397585}, 20] (* Harvey P. Dale, Jan 07 2023 *)

Prog

(PARI) a(n)=6^n+n^6 \\ Charles R Greathouse IV, Feb 14 2011
(Magma) [6^n+n^6: n in [0..30]]; // Vincenzo Librandi, Oct 27 2011
(Sage) [6^n+n^6 for n in (0..30)] # Bruno Berselli, Aug 28 2014

Crossrefs

Cf. sequences of the form k^n+n^k: A001580 (k=2), A001585 (k=3), A001589 (k=4), A001593 (k=5), this sequence (k=6), A001596 (k=7), A198401 (k=8), A185277 (k=9), A177068 (k=10), A177069 (k=11).

Sequence in context: A340887 A272957 A123616 * A297151 A052752 A357336

Adjacent sequences: A001591 A001592 A001593 * A001595 A001596 A001597

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved