

A008997


Orchard problem with 5 trees in a row (may not have all been proved optimal).


3



1, 1, 1, 1, 2, 2, 2, 3, 3, 4, 6, 6, 7, 9, 10, 11
(list;
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listen;
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internal format)



OFFSET

5,5


COMMENTS

Berloquin shows that a(21) >= 12.


REFERENCES

S. A. Burr, B. Gr\"{u}nbaum and N. J. A. Sloane, The Orchard Problem, Geometriae Dedicata, 2 (1974), 397424.
M. Gardner, Time Travel and Other Mathematical Bewilderments. Freeman, NY, 1988, Chap. 22.


LINKS

Table of n, a(n) for n=5..20.
S. A. Burr, B. Gr\"{u}nbaum and N. J. A. Sloane, The Orchard Problem, Geometriae Dedicata, 2 (1974), 397424.
P. Berloquin, a(21) >= 12 (from an article in Jeux & Strategies from 1983  see Fig. 13)
Eric Weisstein's World of Mathematics, OrchardPlanting Problem


CROSSREFS

Cf. A003035, A006065.
Sequence in context: A123576 A094824 A029054 * A005851 A139821 A077563
Adjacent sequences: A008994 A008995 A008996 * A008998 A008999 A009000


KEYWORD

nonn,nice


AUTHOR

N. J. A. Sloane.


STATUS

approved



