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A221961 Number of n X n symmetric lonesum ternary matrices. 2
1, 3, 18, 149, 1390, 13377 (list; graph; refs; listen; history; text; internal format)
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: A074525 A118331 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 September 16 07:16 EDT 2021. Contains 347469 sequences. (Running on oeis4.)