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A157061 Number of integer sequences of length n+1 with sum zero and sum of absolute values 24 1
2, 72, 1442, 20260, 220250, 1958460, 14768810, 96900810, 563873400, 2953859370, 14097919968, 61908797418, 252208679268, 959882556570, 3433533723900, 11603837100660, 37221177046410, 113779617228060, 332648955112250, 933146517188760, 2518877938240202 (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,12); 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: A030993 A283568 A070775 * A179957 A221549 A289197

Adjacent sequences:  A157058 A157059 A157060 * A157062 A157063 A157064

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 22 2009

STATUS

approved

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Last modified June 1 18:43 EDT 2020. Contains 334762 sequences. (Running on oeis4.)