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A194541 Partial sums of A004080. 0
1, 5, 16, 47, 130, 357, 973, 2647, 7197, 19564, 53181, 144561, 392958, 1068172, 2903593, 7892784, 21454811, 58320223, 158530804, 430931404, 1171393005, 3184176320, 8655488630, 23528057461, 63955891057, 173850136486, 472573666887, 1284588411309 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The ratio of a(n) to A004080(n+1) converges to e/(e-1), which is approximately equal to 1.581976706. For example, a(21)/A004080(22) = 1171393005/740461601 = 1.581976706716...

LINKS

Table of n, a(n) for n=1..28.

Ronald E. Bruck, Maths_Exam_Solns (see page 6).

CROSSREFS

Cf. A004080.

Sequence in context: A055552 A086750 A086749 * A094586 A140336 A197201

Adjacent sequences:  A194538 A194539 A194540 * A194542 A194543 A194544

KEYWORD

nonn

AUTHOR

Joseph Foley, Aug 28 2011

STATUS

approved

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Last modified May 27 05:24 EDT 2020. Contains 334649 sequences. (Running on oeis4.)