1073807361

Appears in sequences

• a(n) = (2^n + 1)^2.at n=15A028400
• a(2n) = 2*4^n-1, a(2n+1) = (2^(n+1)+1)^2; interlaces A083420 with A028400.at n=29A107663
• Maximum number of rational points on a smooth absolutely irreducible projective curve of genus 1 over the field F_2^n.at n=29A169872
• 1/4 the number of (n+1) X 2 binary arrays with all 2 X 2 subblock sums the same.at n=30A183978
• Number of 4 X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=13A208556
• a(n) = 9*J(n)^2 where J(n) are the Jacobsthal numbers A001045 with J(0) = 1.at n=15A323210
• a(n) = Sum_{d|n} tau(d)^n, where tau(n) is the number of divisors of n.at n=14A344080
• a(n) is the least perfect power > 2^n.at n=30A357751