|
Search: id:A006774
|
|
|
| A006774 |
|
Number of 2n-step polygons on honeycomb.
(Formerly M2257)
|
|
+0
1
|
|
| 1, 0, 3, 2, 12, 18, 65, 138, 432, 1074, 3231, 8718, 25999, 73650, 220215, 643546, 1937877, 5783700, 17564727, 53222094, 163009086, 499634508, 1542392088, 4770925446, 14832934031, 46227584010, 144632622552, 453628244950
(list; graph; listen)
|
|
|
OFFSET
|
3,3
|
|
|
REFERENCES
|
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
I. G. Enting and A. J. Guttmann, Polygons on the honeycomb lattice, J. Phys. A 22 (1989), 1371-1384.
|
|
LINKS
|
I. Jensen, Table of n, a(n) for n = 3..79 (from link below)
I. Jensen, More terms
|
|
CROSSREFS
|
Sequence in context: A167639 A113205 A136657 this_sequence A086551 A007214 A025232
Adjacent sequences: A006771 A006772 A006773 this_sequence A006775 A006776 A006777
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com).
|
|
|
Search completed in 0.002 seconds
|
