A115205 - OEIS

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A115205

a(n) = binomial(n, 9) + 1.

1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 11, 56, 221, 716, 2003, 5006, 11441, 24311, 48621, 92379, 167961, 293931, 497421, 817191, 1307505, 2042976, 3124551, 4686826, 6906901, 10015006, 14307151, 20160076, 28048801, 38567101, 52451257, 70607461, 94143281, 124403621

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

OFFSET

0,10

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..10000

FORMULA

G.f.: ((3*x^2-3*x+1)*(3*x^6-9*x^5+18*x^4-21*x^3+15*x^2-6*x+1))/(x-1)^10. [Maksym Voznyy (voznyy(AT)mail.ru), Jul 27 2009]

a(n) = (1/9!)*(n+1)*(n^8 - 37*n^7 + 583*n^6 - 5119*n^5 + 27568*n^4 - 94852*n^3 + 212976*n^2 - 322560*n + 9!) = binomial(n,9)+1. - G. C. Greubel, Feb 05 2016

MAPLE

seq(binomial(n, 9)+1, n=0..26); # Zerinvary Lajos, Jan 13 2007

MATHEMATICA

Table[1 + Binomial[n, 9], {n, 0, 20}] (* G. C. Greubel, Feb 05 2016 *)

PROG

(PARI) a(n) = binomial(n, 9) + 1; \\ Altug Alkan, Feb 05 2016

(Magma) [Binomial(n, 9)+1: n in [0..50]]; // Vincenzo Librandi, Feb 05 2016

CROSSREFS

Cf. A035927.

Sequence in context: A037731 A221019 A371439 * A306753 A306860 A212388

Adjacent sequences: A115202 A115203 A115204 * A115206 A115207 A115208

KEYWORD

nonn,easy

AUTHOR

Roger L. Bagula, Mar 03 2006

STATUS

approved