315490896

Appears in sequences

• a(n) is the number of subsets of {1..n} that contain 5 even and 5 odd numbers.at n=41A331576
• a(n) = C(n, Q(n+3, 4)-1)*C(n, Q(n+1, 4)) + C(n, Q(3*n+1, 4))*C(n, Q(3*n+3, 4)) where C = binomial and Q(x, y) = floor(x/y).at n=20A380121