OFFSET
0,2
FORMULA
1->{3}, 2->{1}, 3->{2, 4}, 4->{6}, 5->{3}, 6->{7, 8}, 7->{8} 8->{6}
MATHEMATICA
s[1] = {3}; s[2] = {1}; s[3] = {2, 4}; s[4] = {6}; s[5] = {3}; s[6] = {7, 8}; s[7] = {8}; s[8] = {6}; t[a_] := Join[a, Flatten[s /@ a]]; p[0] = {1}; p[1] = t[{1}]; p[n_] := t[p[n - 1]] aa = p[6]
CROSSREFS
KEYWORD
nonn,uned
AUTHOR
Roger L. Bagula, May 13 2005
STATUS
approved