OFFSET
1,4
COMMENTS
The old entry with this sequence number was a duplicate of A037444.
REFERENCES
J. Q. Longyear, personal communication.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences. San Diego, CA: Academic Press, 1995; entry M1139.
LINKS
F. Goebel and R. P. Nederpelt, The number of numerical outcomes of iterated powers, Amer. Math. Monthly, 80 (1971), 1097-1103.
R. K. Guy and J. L. Selfridge, The nesting and roosting habits of the laddered parenthesis, Amer. Math. Monthly 80 (8) (1973), 868-876.
J. Longyear, T. Trotter, N. J. A. Sloane, Correspondence
CROSSREFS
KEYWORD
dead
STATUS
approved