login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A157063 Number of integer sequences of length n+1 with sum zero and sum of absolute values 28. 1
2, 84, 1962, 32130, 406800, 4208610, 36881420, 280819260, 1893408750, 11472968760, 63221641758, 319917948246, 1498750896708, 6545498596110, 26808012135000, 103501142484360, 378407481456870, 1315394383751460, 4363052456797550, 13853429338548630 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

T. D. Noe, Table of n, a(n) for n = 1..1000

FORMULA

a(n)=T(n,14); T(n,k)=sum({i=1..n}binomial(n+1,i)*binomial(k-1,i-1)*binomial(n-i+k,k))

CROSSREFS

Cf. A103881, A156554.

Sequence in context: A205643 A215263 A265591 * A288312 A289198 A318128

Adjacent sequences:  A157060 A157061 A157062 * A157064 A157065 A157066

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 22 2009

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 February 17 15:32 EST 2020. Contains 331998 sequences. (Running on oeis4.)