52420

Appears in sequences

• Define C(n) by the recursion C(0) = 2*i where i^2 = -1, C(n+1) = 1/(1 + C(n)), then a(n) = 2*(-1)^n/Im(C(n)) where Im(z) denotes the imaginary part of the complex number z.at n=11A069959
• Partial sums of floor(2^n/5).at n=16A178452
• Number of (w,x,y) with all terms in {0,...,n} and w != max(|w-x|,|x-y|,|y-w|).at n=37A213498
• Number of n X n 0..2 matrices with each 2 X 2 subblock idempotent.at n=12A224659