67296

Appears in sequences

• Number of planted identity trees where non-root, non-leaf nodes an even distance from root are of degree 2.at n=23A007560
• Number of 5X2 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2*n^2 (number of collections of 5 zero-sum 2-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=30A192705
• G.f.: Sum_{n>=0} (1 + x)^(n*(n+1)/2) / 2^n.at n=5A265937