83300

Appears in sequences

• Number of possible rook moves on an n X n chessboard.at n=34A035006
• Numbers k such that k and k^2 use only the digits 0, 3, 6, 8 and 9.at n=44A136945
• a(n)=If[IntegerQ[((3*n - 2)/( n + 1))*a(n - 1)], ((3*n - 2)/(n + 1))* a(n - 1), If[IntegerQ[((4*n - 2)/(n + 1))*a( n - 1)], ((4*n - 2)/(n + 1))*a(n - 1), n*a(n - 1)]].at n=12A155580
• Molecular topological index of the Andrásfai graphs.at n=16A192790
• Number of zeros in the period of Fibonacci 5-step sequence A001591 mod n.at n=38A193994
• Number of -n..n arrays of 4 elements with zero sum and no two neighbors summing to zero.at n=24A199833
• Exponential weird numbers: numbers that are exponential abundant (A129575) but not exponential pseudoperfect (A318100).at n=4A321146
• Coreful weird numbers: numbers k that are coreful abundant (A308053) but no subset of their aliquot coreful divisors sums to k.at n=4A339939
• a(n) = 16^n * Sum_{k=0..n} binomial(1/2, k)^2.at n=4A358364