491734

Appears in sequences

• Consider problem of placing N queens on an n X n board so that each queen attacks precisely k others. Here k=4 and sequence gives number of different solutions when N takes its maximal value.at n=10A019654
• Consider problem of placing N queens on an n X n board so that each queen attacks precisely k others. Here k=4 and sequence gives number of inequivalent solutions when N = 3*n-3.at n=8A051571