OFFSET
0,4
COMMENTS
a(n) tells from how many starting values one can end to 0 in n steps, with the iterative process described in A219642 (if going around in 0->0 loop is disallowed).
LINKS
A. Karttunen, Table of n, a(n) for n = 0..10000
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Nov 24 2012
STATUS
approved