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A132790 Row sums of triangle A132789. 2
1, 2, 6, 18, 53, 158, 486, 1550, 5109, 17298, 59799, 210048, 746983, 2682618, 9711214, 35390422, 129710309, 477769754, 1767525315, 6564644688, 24467315575, 91484660770, 343063807931, 1289912535908, 4861963178643, 18367386626558, 69533618024841, 263748085968060 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
a(n) = Sum_{k=1..n} binomial(n-1,k-1)*(1 + binomial(n,k-1)/k) - 1. - Andrew Howroyd, Sep 01 2018
EXAMPLE
a(4) = 18 = sum of row 4 terms of triangle A132789: (1 + 8 + 8 + 1).
PROG
(PARI) a(n)=sum(k=1, n, binomial(n-1, k-1)*(1 + binomial(n, k-1)/k) - 1); \\ Andrew Howroyd, Sep 01 2018
CROSSREFS
Cf. A132789.
Sequence in context: A252822 A094864 A120010 * A358417 A214799 A072850
KEYWORD
nonn
AUTHOR
Gary W. Adamson, Aug 30 2007
EXTENSIONS
Terms a(11) and beyond from Andrew Howroyd, Sep 01 2018
STATUS
approved

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Last modified March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)