20863

Appears in sequences

• Expansion of (3 + x^2) / (1 - x)^4.at n=30A037237
• Indices of primes in sequence defined by A(0) = 73, A(n) = 10*A(n-1) - 17 for n > 0.at n=5A101131
• Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 6,2,1,0,0,0,1 for x=0,1,2,3,4,5,6.at n=4A203220
• Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any element within a city block distance of two, and containing the value n(n+1)/2-2.at n=19A212039
• a(n) = number of triples (a,b,c) of natural numbers a,b,c <= n with gcd(a,b)=gcd(b,c)=gcd(c,a)=1.at n=40A256390
• The number of edges formed on an isosceles triangle by straight line segments mutually connecting all vertices and all points that divide the two equal length sides into n equal parts; the base of the triangle contains no points other than its vertices.at n=14A333027