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A157056 Number of integer sequences of length n+1 with sum zero and sum of absolute values 14 +0
1
2, 42, 492, 4060, 26070, 137886, 623576, 2476296, 8809110, 28512110, 85014204, 235895244, 614266354, 1511679210, 3536846160, 7907476016, 16967926746, 35078339106, 70098276620, 135798494460, 255689552382, 468969729382 (list; graph; listen)
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: A048373 A066563 A070808 this_sequence A140170 A038396 A162678

Adjacent sequences: A157053 A157054 A157055 this_sequence A157057 A157058 A157059

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Feb 22 2009

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.


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