133305

Appears in sequences

• Expansion of e.g.f. arcsin(tan(x)) (odd powers only).at n=4A012780
• Number of 8X2 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 8 zero-sum 2-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=20A192708