126336

Appears in sequences

• First row of spectral array W(sqrt(5)-1).at n=14A022165
• a(0)=0, a(1)=1; for n>1, a(n) = 6*a(n-1)-4*a(n-2).at n=8A084326
• Number of permutations i_1,...,i_n of 1,...,n with i_1 = 1 and i_n = n, and with the n adjacent sums i_1+i_2, i_2+i_3, ..., i_{n-1}+i_n, i_n+i_1 all coprime to n.at n=10A228860
• a(n) = phi(A291789(n)).at n=26A291805
• The number of regions inside a pentagon formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.at n=8A331929
• Triangular array read by rows: T(n,0) = 2^n, T(n,k) = Sum_{i=n-k..n, j=0..i-n+k, i<>n or j<>k} T(i,j) for k > 0.at n=43A337129