OFFSET
0,1
MATHEMATICA
s[1] = {2}; s[2] = {3}; s[3] = {4}; s[4] = {1, 2, 3, 4};
t[a_] := Flatten[s /@ a];
p[0] = {1}; p[1] = t[p[0]]; p[n_] := t[p[n - 1]]
aa = p[10]
CROSSREFS
KEYWORD
nonn,easy,less
AUTHOR
Roger L. Bagula, May 12 2005
STATUS
approved