login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A027932 T(n,2n-9), T given by A027926. 2
1, 3, 8, 21, 55, 143, 364, 894, 2098, 4685, 9955, 20175, 39130, 72905, 130965, 227612, 383911, 630191, 1009242, 1580345, 2424289, 3649547, 5399802, 7863034, 11282400, 15969161, 22317933, 30824563, 42106956, 56929205 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..34.

Index entries for linear recurrences with constant coefficients, signature (10,-45,120,-210,252,-210,120,-45,10,-1).

FORMULA

a(n)=sum(binomial(n-k, 9-2k), k=0..4). - Len Smiley, Oct 20 2001

a(n)=C(n,n-1)+C(n+1,n-2)+C(n+2,n-3)+C(n+3,n-4)+C(n+4,n-5), n>=1 . - Zerinvary Lajos, May 29 2007

G.f.: x^5*(1-7*x+23*x^2-44*x^3+55*x^4-44*x^5+23*x^6-7*x^7+x^8) / (x-1)^10 . - R. J. Mathar, Oct 31 2015

MAPLE

A027932 := proc(n)

1/362880 *(n-4) *(n^8 -32*n^7 +490*n^6 -4592*n^5 +30289*n^4 -147728*n^3 +543780*n^2 -1359648*n +1905120)

end proc:

seq(A027932(n), n=5..30) ; # R. J. Mathar, Jun 29 2012

CROSSREFS

Cf. A228074.

Sequence in context: A292619 A231222 A231436 * A084625 A088305 A001906

Adjacent sequences:  A027929 A027930 A027931 * A027933 A027934 A027935

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified February 17 22:32 EST 2018. Contains 299297 sequences. (Running on oeis4.)