56818

Appears in sequences

• Number of 4 X n binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.at n=38A266937
• G.f.: Sum_{n>=0} (1 + (1+x)^(n+1))^n * x^n.at n=8A326276
• a(n) = Sum_{i=1..n} sigma(i)*sigma(i+1), where sigma(n) = A000203(n) is the sum of the divisors of n.at n=39A330322