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A090200 revision #20

A090200

N(7,n) where N(7,x) is the 7th Narayana polynomial.

1, 429, 4279, 20071, 65445, 171481, 387739, 788019, 1476841, 2596645, 4335711, 6936799, 10706509, 16025361, 23358595, 33267691, 46422609, 63614749, 85770631, 113966295, 149442421, 193620169, 248117739, 314767651

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Table of n, a(n) for n=0..23.

Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).

FORMULA

a(n) = N(7, n)= Sum_{k>0} A001263(7, k)*n^(k-1) =n^6 + 21*n^5 + 105*n^4 + 175*n^3 + 105*n^2 + 21*n + 1.

G.f.: (1+422*x+1297*x^2-908*x^3-173*x^4+85*x^5-5*x^6)/(1-x)^7. - Philippe Deléham, Apr 03 2013

MATHEMATICA

LinearRecurrence[{7, -21, 35, -35, 21, -7, 1}, {1, 429, 4279, 20071, 65445, 171481, 387739}, 30] (* Harvey P. Dale, Feb 10 2019 *)

PROG

(PARI) a(n)=n^6+21*n^5+105*n^4+175*n^3+105*n^2+21*n+1\\ Charles R Greathouse IV, Jan 17 2012

CROSSREFS

Cf. A008550.

Sequence in context: A064061 A244104 A115133 * A033279 A145056 A064304

Adjacent sequences: A090197 A090198 A090199 * A090201 A090202 A090203

KEYWORD

nonn,easy

AUTHOR

Philippe Deléham, Jan 22 2004

EXTENSIONS

Corrected by T. D. Noe, Nov 09 2006

STATUS

approved