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 A317223 a(0) = 0, a(1) = 1; for n >= 2, a(n) = freq(a(freq(a(n-1),n)),n) where freq(i, j) is the number of times i appears in the terms a(0) .. a(j-1). 3
 0, 1, 1, 2, 2, 2, 3, 2, 4, 2, 5, 2, 1, 6, 3, 3, 6, 3, 6, 6, 6, 6, 4, 3, 6, 6, 2, 7, 3, 6, 7, 3, 7, 7, 7, 7, 7, 7, 2, 2, 9, 3, 2, 1, 10, 4, 10, 4, 10, 10, 10, 10, 8, 4, 10, 10, 5, 4, 8, 4, 10, 10, 2, 11, 4, 8, 11, 4, 11, 11, 11, 11, 8, 11, 11, 9, 4, 2, 4, 12, 4, 4, 9, 12, 4, 8, 12, 12, 12, 12, 8, 8, 12, 12, 14, 4, 8 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS Alois P. Heinz, Table of n, a(n) for n = 0..65536 Alois P. Heinz, Log plot of n, a(n) for n = 0..2^20 MAPLE b:= proc() 0 end: a:= proc(n) option remember; local t;       t:= `if`(n<2, n, b(a(b(a(n-1)))));       b(t):= b(t)+1; t     end: seq(a(n), n=0..200);  # Alois P. Heinz, Jul 24 2018 CROSSREFS Cf. A316774, A317015, A317127. Sequence in context: A249616 A307408 A233539 * A321576 A304101 A278636 Adjacent sequences:  A317220 A317221 A317222 * A317224 A317225 A317226 KEYWORD nonn AUTHOR Altug Alkan, Jul 24 2018 STATUS approved

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Last modified August 18 08:57 EDT 2019. Contains 326077 sequences. (Running on oeis4.)