20383

Appears in sequences

• Semiperimeter of primitive Pythagorean triangles having legs that add up to a square, sorted on hypotenuse.at n=18A089549
• A new general triangle sequence based on the Eulerian form in three parts ( subtraction):m=2; t0(n,k)=If[n*k == 0, 1, Sum[(-1)^j Binomial[n + 1, j](k + 1 - j)^n, {j, 0, k + 1}]] t(n,k,m)=If[n == 0, 1, ( m*(n - k) + 1)*t0(n - 1 + 1, k - 1) + (m*k + 1)*t0(n - 1 + 1, k) - m*k*(n - k)*t0(n - 2 + 1, k - 1)].at n=31A157180
• A new general triangle sequence based on the Eulerian form in three parts ( subtraction):m=2; t0(n,k)=If[n*k == 0, 1, Sum[(-1)^j Binomial[n + 1, j](k + 1 - j)^n, {j, 0, k + 1}]] t(n,k,m)=If[n == 0, 1, ( m*(n - k) + 1)*t0(n - 1 + 1, k - 1) + (m*k + 1)*t0(n - 1 + 1, k) - m*k*(n - k)*t0(n - 2 + 1, k - 1)].at n=32A157180
• a(n) = 784*n - 1.at n=25A158399
• a(n) = 26*n^2 - 1.at n=27A158551
• Triangle of coefficients of polynomials u(n,x) jointly generated with A209831; see the Formula section.at n=51A209830
• a(n) = n^3 - 2*n^2 - 1.at n=27A214731
• Number of integer partitions of n with integer alternating product.at n=45A347446
• Starts of runs of 3 consecutive integers that are Stolarsky-Niven numbers (A364123).at n=4A364125