60801

Appears in sequences

• Convolution of A001950 with itself.at n=36A023667
• Numbers k such that phi(sigma(k)+k) = sigma(k).at n=25A068366
• Diagonal in array of n-gonal numbers A081422.at n=38A081437
• Number of pairs with two different elements which can be obtained by selecting unique elements from two sets with n+1 and n^2 elements respectively and n common elements.at n=39A085490
• a(n) = 38*n^2 + 1.at n=40A158593
• Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any diagonal or antidiagonal neighbor, and containing the value n(n+1)/2-2.at n=25A211958
• Expansion of (eta(q)eta(q^10)/(eta(q^2)eta(q^5)))^6 in powers of q.at n=26A284629
• a(n) = [x^n] Product_{k>=1} ((1 - x^(5*k))/(1 - x^k))^n.at n=8A296163
• a(n) is the number of solid (3D) partitions of n with 2 layers and second layer a plane partition of 3.at n=13A381265