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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A025141 a(n) = (k-1)st elementary symmetric function of C(n,0), C(n,1), ..., C(n,k), where k = floor( n/2 ). 1
1, 1, 11, 16, 551, 1190, 178024, 564678, 410606100, 1876011225, 6915255136416, 44675417804160, 847468391006481244, 7637169791538787500, 749927054569389785088000, 9345619999880270191554560, 4766524174302701575265292220416, 81712716729371439637617531305856 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,3

LINKS

Andrew Howroyd, Table of n, a(n) for n = 2..50

PROG

(PARI)

ESym(u)={my(v=vector(#u+1)); v[1]=1; for(i=1, #u, my(t=u[i]); forstep(j=i, 1, -1, v[j+1]+=v[j]*t)); v}

a(n)={if(n>=2, ESym(binomial(n)[1..1+n\2])[n\2])} \\ Andrew Howroyd, Dec 19 2018

CROSSREFS

Sequence in context: A032327 A032075 A024147 * A226678 A105709 A256546

Adjacent sequences:  A025138 A025139 A025140 * A025142 A025143 A025144

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

Terms a(14) and beyond from Andrew Howroyd, Dec 19 2018

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 24 11:18 EDT 2019. Contains 323529 sequences. (Running on oeis4.)