A221961 Number of n X n symmetric lonesum ternary matrices.

1, 3, 18, 149, 1390, 13377

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: A240921 A373771 A379249 * A138420 A152409 A200320

Adjacent sequences: A221958 A221959 A221960 * A221962 A221963 A221964

Keyword

nonn,more

Author

N. J. A. Sloane, Feb 05 2013

Status

approved