OFFSET
1,4
LINKS
R. Zumkeller, Table of n, a(n) for n = 1..10000
EXAMPLE
a(20) = #{1+19,2+18,3+17,4+16,5+15,7+13,8+12,9+11} = 8;
a(21) = #{2+19,3+18,4+17,5+16,6+15,8+13,9+12} = 7;
a(22) = #{3+19,4+18,5+17,6+16,7+15,9+13,11+11} = 7;
a(23) = #{4+19,5+18,6+17,7+16,8+15,11+12} = 6;
a(24) = #{1+23,5+19,6+18,7+17,8+16,9+15,11+13,12+12} = 8.
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Feb 11 2008
STATUS
approved