10758400

Appears in sequences

• a(n) = (1 + 3^n - 2*3^(n/2))/4 if n is even, (1 + 3^n - 4*3^((n-1)/2))/4 if n odd.at n=15A107767
• Number of partitions of {1,...,2*n} into even sized blocks such that no block size is repeated.at n=9A115278
• a(n) = ((3^(n-1) - 1)^2)/4.at n=8A238976
• a(0) = 0; for n >= 1, one quarter of the number of points on the elliptic curve y^2 = x^3 - x defined over GF(3^n).at n=16A382171