

A247417


Number of nonisomorphic binary n X n matrices with two 1's per column under row and column permutations.


5



1, 3, 11, 35, 132, 471, 1806, 7042, 28494, 118662, 510517, 2262738, 10337474, 48625631, 235357470, 1171163995, 5986424739, 31403695142, 168913667164, 930739116386, 5249162406890, 30275048671498, 178428441191289, 1073737691984694, 6592909590432719
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

2,2


LINKS



MAPLE

Using the uploaded program the call is seq(matrix_marks(n, 2), n=3..15);


PROG



CROSSREFS



KEYWORD

nonn


AUTHOR



EXTENSIONS



STATUS

approved



