174933

Appears in sequences

• Number of rational knots (or two-bridge knots) with n crossings (up to mirroring).at n=19A018240
• Duplicate of A018240.at n=19A090596
• a(n) = - a(n-1) + 5(a(n-2) + a(n-3)) - 2(a(n-4) + a(n-5)) - 8(a(n-6) + a(n-7)).at n=20A090597
• Triangle of sums of Jacobsthal numbers related to binomial(4n,n)/(3n+1) mod 4.at n=40A113049
• a(n) = 3*a(n-1) - 4*a(n-2) + 6*a(n-3) - 4*a(n-4), with initial terms 0,0,0,1.at n=20A136401
• Positive integers that are palindromes (of even length) in binary, each made by concatenating two identical binary palindromes.at n=35A161400
• a(1)=1. For n>1, a(n) equals the smallest number > a(n-1) of the form a(k) U j U a(k) U j, where U represents concatenation (written in decimal) of the binary representation of the arguments, where 1<=k < n, and j = {0} or {1} or {}.at n=21A175336
• (A192466)/2.at n=9A192467