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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A157056 Number of integer sequences of length n+1 with sum zero and sum of absolute values 14 0
2, 42, 492, 4060, 26070, 137886, 623576, 2476296, 8809110, 28512110, 85014204, 235895244, 614266354, 1511679210, 3536846160, 7907476016, 16967926746, 35078339106, 70098276620, 135798494460, 255689552382, 468969729382 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n)=T(n,7); T(n,k)=sum({i=1..n}binomial(n+1,i)*binomial(k-1,i-1)*binomial(n-i+k,k))

CROSSREFS

A103881 A156554

Sequence in context: A066563 A202865 A070808 * A180425 A140170 A038396

Adjacent sequences:  A157053 A157054 A157055 * A157057 A157058 A157059

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Feb 22 2009

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

Content is available under The OEIS End-User License Agreement .

Last modified February 14 07:57 EST 2012. Contains 205603 sequences.