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A221961
Number of n X n symmetric lonesum ternary matrices.
2
1, 3, 18, 149, 1390, 13377
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..5.
H. K. Kim, D. S. Krotov and J. Y. Lee,
Matrices uniquely determined by their lonesums
, Linear Algebra and its Applications, 438 (2013) no 7, 3107-3123
FORMULA
Kim et al. (2013) give a formula.
CROSSREFS
Cf.
A000629
(the binary case).
See also
A299906
,
A299907
for the general binary case.
Sequence in context:
A118331
A371825
A240921
*
A138420
A152409
A200320
Adjacent sequences:
A221958
A221959
A221960
*
A221962
A221963
A221964
KEYWORD
nonn
,
more
AUTHOR
N. J. A. Sloane
, Feb 05 2013
STATUS
approved
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Last modified April 23 02:14 EDT 2024. Contains 371906 sequences. (Running on oeis4.)