37271025

Appears in sequences

• Number of 4Xn 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 0 1 and 1 1 0 vertically.at n=27A207404
• Number of (n+1) X (1+1) arrays of permutations of 0..n*2+1 with each element having directed index change 2,-1 1,0 2,1 0,-1 -2,-2 or -1,0.at n=22A264484
• a(n) = T(A285984(n))^2, where T(m) is the m-th triangular number A000217(m).at n=1A286037