

A063892


a(1) = a(2) = a(3) = 1, a(n) = a(na(n2))+a(na(n3)) for n>3.


6



1, 1, 1, 2, 4, 6, 5, 3, 3, 9, 6, 4, 7, 12, 9, 5, 7, 10, 16, 16, 10, 12, 12, 16, 14, 21, 13, 17, 8, 14, 24, 26, 19, 12, 8, 23, 22, 23, 12, 17, 18, 28, 35, 26, 16, 22, 34, 47, 22, 6, 10, 36, 69, 36
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,4


COMMENTS

Undefined for n>54 since a(53)=69>=55.


LINKS

Table of n, a(n) for n=1..54.


EXAMPLE

a(7) = a(7a(5))+a(7a(4)) = a(74)+a(72) = a(3)+a(5) = 1+4 = 5.


MAPLE

#Q(r, s) with initial values 1, 1, 1, ..., from N. J. A. Sloane, Apr 15 2014
r:=2; s:=3;
a:=proc(n) option remember; global r, s;
if n <= s then 1
else
if (a(nr) <= n) and (a(ns) <= n) then
a(na(nr))+a(na(ns));
else lprint("died with n =", n); return (1);
fi;
fi; end;
[seq(a(n), n=1..54)];


CROSSREFS

Cf. A005185, A046700, A063882, A226222.
See A064714 for a variant which does not die.
Sequence in context: A242796 A298527 A071288 * A254763 A023825 A022485
Adjacent sequences: A063889 A063890 A063891 * A063893 A063894 A063895


KEYWORD

fini,full,nonn


AUTHOR

Henry Bottomley, Aug 29 2001


STATUS

approved



