19764

Appears in sequences

• Number of (undirected) Hamiltonian paths in n-Moebius ladder.at n=27A020875
• Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,3.at n=7A037590
• Sums of 2 distinct powers of 3.at n=40A038464
• a(n) = T(n,n-6), array T as in A055807.at n=12A055811
• Number of ways to place 3 nonattacking queens on a 3 X n board.at n=30A061989
• Solution to the Dancing School Problem with 3 girls and n+3 boys: f(3,n).at n=27A079908
• a(1)=1, a(2)=2 and a(n+1) is minimal such that there are a(n-1) primes strictly between a(n) and a(n+1).at n=10A082279
• a(n) = (3^n + 2*3^(n/2)*cos(n*Pi/6))/3.at n=10A092236
• a(n) = (n-1)*(n+2)*(2*n+11)/2.at n=24A130862
• Inverse binomial transform of (A113405 preceded by 0).at n=11A133474
• Irregular triangle read by rows: first row is 1, and the n-th row gives the coefficients in the expansion of (1/2*x)*(1 - 2*x*(1 - x))^(n + 1)*Li(-n, 2*x*(1 - x)), where Li(n, z) is the polylogarithm.at n=48A142147
• a(n) = the smallest multiple of the n-th prime such that (a(n)+1) is divisible by both the (n-1)th prime and the (n+1)st prime.at n=16A143243
• 1/5 of the number of 5-colorings of a planar n X n X n triangular grid.at n=3A153468
• Numbers n such that the sum of the squares of the digits of n^n is a square.at n=22A171976
• Averages of two consecutive even cubes: (n^3 + (n+2)^3)/2.at n=13A173961
• a(n) = 61*n^2.at n=18A174333
• Molecular topological indices of the prism graphs Y_n.at n=17A192838
• Floor((n+1/n)^3).at n=26A197602
• a(n) = round((n+1/n)^3).at n=26A197986
• Numbers of the form 3^j + 9^k, for j and k >= 0.at n=37A226827