18501

Appears in sequences

• Stella octangula numbers: a(n) = n*(2*n^2 - 1).at n=21A007588
• Number of 5-compositions of n.at n=5A145841
• a(n) = 841*n - 1.at n=21A158402
• a(n) = 22*n^2 - 1.at n=28A158540
• Row sums of A163233 and A163235 divided by 3.at n=41A163478
• Small rhombicuboctahedron with faces of centered polygons.at n=10A193250
• Numbers n such that phi(n) = phi(n+12) and n is not divisible by 2.at n=26A217141
• Number A(n,k) of compositions of n where each part i is marked with a word of length i over a k-ary alphabet whose letters appear in alphabetical order; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=60A261780
• Number of compositions of n where each part i is marked with a word of length i over an n-ary alphabet whose letters appear in alphabetical order.at n=5A261783
• T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having directed index change 0,1 0,-1 -2,0 or 1,1.at n=57A264878
• Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 with each element having directed index change 0,1 0,-1 -2,0 or 1,1.at n=8A264880
• Sum of the next n nonnegative integers repeated (A004526).at n=41A319007
• Indices k such that the determinant of the 3 X 3 Hankel matrix of consecutive primes starting at prime(k) is 0.at n=23A392523