27680

Appears in sequences

• Number of triangles a queen can make (starting anywhere) on an n X n board.at n=24A030117
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 83.at n=37A031581
• a(n) = floor(11^n/2^n).at n=6A094972
• Triangle read by rows: T(n,k) is number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1),U=(1,2), or d=(1,-1) and have k hills (a hill is either a ud or a Udd starting at the x-axis).at n=40A108431
• Square array, read by antidiagonals, used to recursively calculate the number of minimax trees A080795.at n=22A185420
• a(n) = floor((n + 1/2)^6).at n=5A219089
• Number of undirected circular permutations i_0, i_1, ..., i_n of 0, 1, ..., n such that all the 2*n+2 numbers |i_0 +/- i_1|, |i_1 +/- i_2|, ..., |i_{n-1} +/- i_n|, |i_n +/- i_0| have the form (p-1)/2 with p an odd prime.at n=13A228956
• Expansion of Product_{k>=2} 1/(1 - x^k)^bigomega(k), where bigomega(k) is the number of prime divisors of k counted with multiplicity (A001222).at n=37A293549