30736

Appears in sequences

• T(n, 2*n-4), T given by A027960.at n=27A027966
• Number of 3 X n binary matrices with no zero rows or columns, up to row and column permutation.at n=18A055609
• Numbers n such that n and 2^n end with the same three digits.at n=30A067866
• a(n) = n*(n+1)*(n^2-2*n+2)/2.at n=16A101375
• Numbers k such that k^2 divides 15^k-1.at n=28A128395
• Pyramidal 47-gonal numbers.at n=15A130566
• Positions of hexagonal pyramidal numbers in the EKG sequence.at n=35A144080
• Number of 6X2 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 6 zero-sum 2-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=20A192706
• a(n) = n*(n + 1)*(5*n^2 + 5*n - 4)/12.at n=16A264853
• Number of relatively prime enriched p-trees of weight n.at n=10A302915