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A015650 Number of ordered 5-tuples of integers from [ 1..n ] with no global factor. 3
1, 5, 19, 49, 118, 225, 434, 729, 1209, 1850, 2850, 4059, 5878, 8044, 11020, 14566, 19410, 24789, 32103, 40213, 50615, 62260, 77209, 93099, 113504, 135431, 162341, 191396, 227355, 264463, 310838, 359322, 417212, 478408, 551944, 626971 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..36.

FORMULA

G.f.: (1/(1 - x)) * Sum_{k>=1} mu(k) * x^k / (1 - x^k)^5. - Ilya Gutkovskiy, Feb 14 2020

CROSSREFS

Cf. A002088, A015631, A015634.

Sequence in context: A277801 A328191 A100104 * A200764 A285987 A055365

Adjacent sequences:  A015647 A015648 A015649 * A015651 A015652 A015653

KEYWORD

nonn

AUTHOR

Olivier Gérard

STATUS

approved

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Last modified March 28 11:00 EDT 2020. Contains 333083 sequences. (Running on oeis4.)