160402

Appears in sequences

• a(0) = 0, and for n > 0, a(n) = A002956(n) - A000041(n).at n=29A181887
• Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,2,1,1,1 for x=0,1,2,3,4.at n=14A197540