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A157060 Number of integer sequences of length n+1 with sum zero and sum of absolute values 22 0
2, 66, 1212, 15620, 155850, 1272810, 8823080, 53265960, 285510150, 1379301990, 6078578508, 24680519604, 93093230958, 328512273390, 1091144804400, 3429182092560, 10244035242630, 29206656395910, 79759293448100 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..19.

FORMULA

a(n)=T(n,11); 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: A131472 A098532 A159716 * A154637 A069865 A218433

Adjacent sequences:  A157057 A157058 A157059 * A157061 A157062 A157063

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 22 2009

STATUS

approved

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Last modified May 27 12:01 EDT 2020. Contains 334657 sequences. (Running on oeis4.)