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A153758 a(n) = SUM_{k=1..n} A153757(k) 1
1, 3, 7, 17, 57, 337, 3737, 72657, 2369257, 127188257, 11156500857 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..11.

FORMULA

A000012 * A153757 = A000012^2 * A003266; where A000012 = the partial sum operator as an infinite lower triangular matrix.

EXAMPLE

a(4) = 17 = (1 + 2 + 4 + 10), where A153757 = (1, 2, 4, 10, 40, 280,...).

CROSSREFS

Cf. A153757, A003266

Sequence in context: A096358 A260349 A146147 * A079634 A047981 A042077

Adjacent sequences:  A153755 A153756 A153757 * A153759 A153760 A153761

KEYWORD

nonn

AUTHOR

Gary W. Adamson, Dec 31 2008

STATUS

approved

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Last modified October 22 10:24 EDT 2019. Contains 328317 sequences. (Running on oeis4.)