A291076 Number of prime 3-ary toroidal arrays with 2 rows and n columns.

3, 18, 116, 810, 5880, 44220, 341484, 2690010, 21522228, 174336264, 1426403748, 11767874940, 97764009000, 817028131140, 6863037256208, 57906879556410, 490505340309600, 4169295414140220, 35548729381861332, 303941636389253448, 2605214026691600584

Offset

1,1

Links

Alois P. Heinz, Table of n, a(n) for n = 1..1000

Veronika Irvine, Lace Tessellations: A mathematical model for bobbin lace and an exhaustive combinatorial search for patterns, PhD Dissertation, University of Victoria, 2016. See Table A.2.

Crossrefs

Sequence in context: A213230 A201695 A074566 * A113328 A196865 A153394

Adjacent sequences: A291073 A291074 A291075 * A291077 A291078 A291079

Keyword

nonn

Author

N. J. A. Sloane, Aug 18 2017

Extensions

More terms from Alois P. Heinz, Aug 20 2017

Status

approved