26530

Appears in sequences

• Expansion of (1+x+x^2)/((1-x^2)*(1-2*x-x^2)); a Pellian-related sequence.at n=11A114697
• a(n) = n*(n^2 + 3*n + 5)/3.at n=42A145069
• Number of 2X4 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 2 zero-sum 4-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=10A192699
• Numbers k such that Bernoulli number B_{k} has denominator 4686.at n=20A295770
• Weird untouchable numbers.at n=13A357326