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A157067 Number of integer sequences of length n+1 with sum zero and sum of absolute values 36 0
2, 108, 3242, 68190, 1107920, 14692734, 164826956, 1604095524, 13799638910, 106481351240, 745616925614, 4783532975546, 28342922553764, 156153427053890, 804648531335960, 3897769097766104, 17828728267167326, 77310179609631564 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n)=T(n,18); 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: A174409 A156502 A111456 * A023281 A042457 A062656

Adjacent sequences:  A157064 A157065 A157066 * A157068 A157069 A157070

KEYWORD

nonn

AUTHOR

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

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.