25050

Appears in sequences

• a(n) = (2*n+1)*(9*n+1).at n=37A033573
• Four-column array read by rows: T(n,k) for k=0..3 is the k-th component of the vector obtained by multiplying the n-th power of the 4 X 4 matrix (1,1,1,1; 7,3,1,0; 12,2,0,0; 6,0,0,0) and the vector (1,1,1,1).at n=21A095797
• Numbers k such that k and k^2 use only the digits 0, 2, 5, 6 and 7.at n=57A136912
• Numbers m such that A166133(m+1) = A166133(m)^2 - 1.at n=35A256703
• Array read by antidiagonals: T(n,k) is the number of k-regular multigraphs on n labeled nodes, loops allowed, n >= 0, k >= 0.at n=71A333467
• Expansion of 1/(1 - 2*x - 3*x^2 - 4*x^3 + 4*x^4).at n=9A375273