239976

Appears in sequences

• First diagonal of A027516.at n=18A027519
• Triangle T(n,k) is the number of restricted growth strings (RGS) of set partitions of {1..n} that have a decrease at index k (1<=k<n).at n=50A056862
• n = k^2 - (reversal of k)^2 for two different values of k.at n=20A087672
• Numbers which can be expressed as the product of numbers made of only sixs.at n=23A161144
• Number of 9X2 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 9 zero-sum 2-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=20A192709
• a(0) = 1 and a(n) = A224704(n) - A224704(n-1).at n=23A316356
• The least totient number k with exactly n solutions to the equation phi(x) = k, where all the solutions are nontotient numbers (A007617).at n=19A378510