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A111413 a(n) = f(f(n+1))-f(f(n)), where f(m) = Euler(m) = A000111(m). 1
0, 0, 0, 15, 19391512129, 703237958001393736999896827714634659411015090272684227831001142371615151 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..6

MAPLE

b:= proc(u, o) option remember;

      `if`(u+o=0, 1, add(b(o-1+j, u-j), j=1..u))

    end:

a:= n-> (f-> f(f(n+1))-f(f(n)))(k-> b(k, 0)):

seq(a(n), n=0..5);  # Alois P. Heinz, Aug 17 2021

CROSSREFS

Cf. A000111.

Sequence in context: A115242 A296528 A072723 * A181029 A072838 A023919

Adjacent sequences:  A111410 A111411 A111412 * A111414 A111415 A111416

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 12 2005

EXTENSIONS

Definition corrected by N. J. A. Sloane, Feb 14 2018

STATUS

approved

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Last modified November 28 21:30 EST 2021. Contains 349415 sequences. (Running on oeis4.)