193620

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 44.at n=19A031722
• a(n) = a(n-1) + a(n-2) + a(n-3) - a(n-4) with a(0) = a(1) = a(2) = 0, a(3) = 1.at n=26A116732
• a(n) = 400*n^2 + 20.at n=22A158601
• Number of length-4 0..n arrays with no repeated value equal to the previous repeated value.at n=19A269468
• a(n) is the number of 2-point antichains in the poset D_{2n+1} of type D, whose elements are compositions of 2n+1.at n=39A344791