68718952449
domain: N
Appears in sequences
- a(n) = (2^n - 1)^2.at n=17A060867
- Resultant of the polynomial x^n-1 and the Chebyshev polynomial of the second kind U_2(x).at n=17A085435
- Smallest square k == 1 (mod some n-th power), k > 1.at n=18A088037
- 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=16A208556
- a(n) = 9*J(n)^2 where J(n) are the Jacobsthal numbers A001045 with J(0) = 1.at n=18A323210