10485760

Appears in sequences

• a(n) = n*2^(n-1).at n=20A001787
• a(n) = 10*4^n.at n=10A002066
• Length of longest trail (i.e., path with all distinct edges) on the edges of an n-cube.at n=20A005985
• Theta series of lattice D20+.at n=7A014747
• a(n) = n*4^n.at n=10A018215
• a(n) = 5 * 2^n.at n=21A020714
• Coordination sequence for diamond structure D^+_20. (Edges defined by l_1 norm = 1.)at n=11A035886
• a(n) = (9*2^n + (-2)^n)/4 for n>0.at n=21A056486
• Numbers k such that k = 2*phi(k) + phi(phi(k)).at n=40A063920
• Permutation of N induced by rotating the node 1 (the top node) left in the infinite planar binary tree shown at A065658.at n=50A065661
• Permutation of N induced by rotating the node 5 right in the infinite planar binary tree shown at A065658.at n=37A065668
• Fourth column of triangle A067410.at n=8A067412
• a(1)=2, a(n+1) = 2*a(n) - phi(a(n)) where phi is the Euler totient function A000010.at n=34A072944
• Expansion of g.f.: (1+x^2)/(1-2*x).at n=23A084215
• Determinant of the symmetric n X n matrix A defined by A[i,j] = |i-j| for 1 <= i,j <= n.at n=20A085750
• Number of n X n circulant singular matrices over GF(2).at n=23A086324
• Number of subsets of {1,.., n} containing exactly one prime.at n=29A089821
• Number of subsets of {1,.., n} containing exactly one square.at n=25A089889
• Number of subsets of {1,.., n} containing exactly two squares.at n=24A089890
• Expansion of g.f. (1-4*x+5*x^2)/(1-2*x)^2.at n=21A097067