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A187548 Alternating partial sums of L(n)*H(n+1), product of central Lah number L(n) and Harmonic number H(n+1). 12
1, 2, 64, 2436, 131824, 9203264, 787735648, 79884060128, 9366719620672, 1246887723480128, 185786630586649792, 30635253866287585088, 5538860010787064796352, 1089574788981508858403648, 231683608824013918904796352, 52954849085008593516185123648 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..15.

FORMULA

a(n) = Sum_{k=0..n} (-1)^(n-k)*A187547(k).

MAPLE

H := proc(n) add(1/i, i=1..n) ; end proc:

A187535 := proc(n) if n=0 then 1; else binomial(2*n-1, n-1)*(2*n)!/n! end if; end proc:

A187547 := proc(n) H(n+1)*A187535(n) ; end proc:

A187548 := proc(n) add( A187547(k)*(-1)^(n-k), k=0..n) ; end proc:

seq(A187548(n), n=0..20) ; # R. J. Mathar, Mar 24 2011

MATHEMATICA

Table[Sum[(-1)^n+(-1)^(n-k)Binomial[2k-1, k-1](2k)!/k!HarmonicNumber[k+1], {k, 1, n}], {n, 0, 12}]

PROG

(Maxima) makelist((-1)^n+sum((-1)^(n-k)*binomial(2*k-1, k-1)*(2*k)!/k!*sum(1/i, i, 1, k+1), k, 1, n), n, 0, 12);

CROSSREFS

Cf. A187535, A001008, A187547.

Sequence in context: A127691 A013822 A010047 * A300640 A054956 A210930

Adjacent sequences:  A187545 A187546 A187547 * A187549 A187550 A187551

KEYWORD

nonn,easy

AUTHOR

Emanuele Munarini, Mar 11 2011

STATUS

approved

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Last modified April 9 20:46 EDT 2020. Contains 333363 sequences. (Running on oeis4.)