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A078503 Binomial(phi(n+1),phi(n)). 0
1, 2, 1, 6, 0, 15, 0, 15, 0, 210, 0, 495, 0, 28, 1, 12870, 0, 18564, 0, 495, 0, 646646, 0, 125970, 0, 18564, 0, 30421755, 0, 5852925, 0, 4845, 0, 735471, 0, 1251677700, 0, 134596, 0, 62852101650, 0, 11058116888, 0, 10626, 0, 7890371113950, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..47.

MATHEMATICA

Table[Binomial[EulerPhi[i + 1], EulerPhi[i]], {i, 1, 50}]

CROSSREFS

Sequence in context: A155183 A211173 A163553 * A288052 A288505 A097407

Adjacent sequences:  A078500 A078501 A078502 * A078504 A078505 A078506

KEYWORD

nonn

AUTHOR

Joseph L. Pe, Jan 05 2003

STATUS

approved

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Last modified April 23 22:58 EDT 2019. Contains 322389 sequences. (Running on oeis4.)