129940

Appears in sequences

• a(n) = |b(n)|^2 = x^2 + 3*y^2 where (x,y,y,y) is the quaternion b(n) of the sequence b of quaternions defined by b(0)=1,b(1)=1, b(n) = b(n-1) + b(n-2)*(0,c,c,c) where c = 1/sqrt(3).at n=17A105309
• Number of (1+1) X (n+1) arrays of permutations of 0..n*2+1 with each element having directed index change 0,1 0,-2 1,0 or -1,0.at n=18A264300
• Number of length-n binary words such that every conjugate (cyclic shift) is rich.at n=23A306316