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A157057 Number of integer sequences of length n+1 with sum zero and sum of absolute values 16 0
2, 48, 642, 6040, 44130, 264936, 1356194, 6077196, 24314490, 88206140, 293744154, 907129236, 2619716554, 7125357540, 18363363690, 45076309166, 105864434424, 238815143406, 519252051080, 1091481669390, 2224042468032, 4403475647758 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n)=T(n,8); 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: A051252 A005429 A035606 * A013523 A009670 A024236

Adjacent sequences:  A157054 A157055 A157056 * A157058 A157059 A157060

KEYWORD

nonn

AUTHOR

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

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Last modified February 15 11:25 EST 2012. Contains 205777 sequences.