103020

Appears in sequences

• a(n) = n^5 + 3*n^3 + 2*n = n*(n^2 + 1)*(n^2 + 2).at n=9A120573
• Number of 6Xn integer arrays with each element equal to the number of horizontal and antidiagonal neighbors not equal to itself.at n=18A265996
• Largest area of triangles with integer sides and area = n times perimeter.at n=4A289156
• Areas of integer-sided triangles whose area equals 5 times their perimeter.at n=46A289221
• Coefficients T(n,k) of x^(4*n+1-k)*y^k in A(x,y) for n >= 0, k = 0..3*n+1, where A(x,y) satisfies: y = Sum_{n=-oo..+oo} (-x)^(n^2) * A(x,y)^((n-1)^2), as an irregular triangle read by rows.at n=31A356501
• a(n) = A356500(3*n, n+1) for n >= 0.at n=4A356506