OFFSET
0,3
LINKS
B. Gordon, T. S. Motzkin, and L. Welch, Permanents of 0,1-matrices, J. Combinatorial Theory Ser. A. 17 (1974), 145--155. MR0384828 (52 #5700a)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 07 2012
STATUS
approved