OFFSET
0,1
FORMULA
1->{2}, 2->{1, 1, 4}, 3->{4}, 4->{2, 3, 3}
MATHEMATICA
s[1] = {2}; s[2] = {1, 1, 4}; s[3] = {4}; s[4] = {2, 3, 3}; t[a_] := Flatten[s /@ a]; p[0] = {1}; p[1] = t[p[0]]; p[n_] := t[p[n - 1]] aa = p[9]
CROSSREFS
KEYWORD
nonn
AUTHOR
Roger L. Bagula, Jun 11 2005
EXTENSIONS
Edited by N. J. A. Sloane, Jul 26 2012
STATUS
approved