A174561 Number of 3 X n Latin rectangles whose second row contains two cycles with the same order of its elements, e.g., the cycle (x_2, x_3, ..., x_k, x_1) with x_1 < x_2 < ... < x_k.

12, 120, 2020, 32410, 563948

Offset

4,1

Links

Table of n, a(n) for n=4..8.

V. S. Shevelev, Reduced Latin rectangles and square matrices with equal row and column sums, Diskr. Mat.(J. of the Akademy of Sciences of Russia) 4(1992), 91-110.

Crossrefs

Cf. A000179, A000186, A094047, A174560, A174556.

Sequence in context: A012565 A012621 A102341 * A009078 A221493 A009149

Adjacent sequences: A174558 A174559 A174560 * A174562 A174563 A174564

Keyword

nonn,more,uned

Author

Vladimir Shevelev, Mar 22 2010

Status

approved