259717522849
domain: N
Appears in sequences
- Pell numbers: a(0) = 0, a(1) = 1; for n > 1, a(n) = 2*a(n-1) + a(n-2).at n=31A000129
- Numbers k such that 2*k^2 - 1 is a square.at n=15A001653
- Primitive parts of Pell numbers.at n=30A008555
- Number of 2 X n binary arrays with a path of adjacent 1's from upper left corner to anywhere in right hand column.at n=28A069306
- Expansion of 1/(1 + 2*x - x^2).at n=30A077985
- a(0) = a(1) = 1; thereafter a(2*n+1) = 2*a(2*n) - a(2*n-1), a(2*n) = 4*a(2*n-1) - a(2*n-2).at n=31A079496
- A nonsense sequence.at n=29A122577
- a(2n) = A100525(n), a(2n+1) = A001653(n+1); a Pellian-related sequence.at n=29A129346
- a(n) = Product_{k=1..floor((n-1)/2)} (4 + 4*cos(k*Pi/n)^2).at n=31A152118
- Pell trisection: Pell(3*n+1), n >= 0.at n=10A187361
- a(n) = 2*a(n-1) + a(n-2) for n > 2, a(0) = a(1) = 1, a(2) = 2.at n=31A215928
- Smallest Pell number (see A000129) divisible by n-th prime.at n=17A239111
- Pairs of integers (a,b) such a^2 + (a+1)^2 = b^2.at n=31A261116
- a(n) is the greatest divisor of A000129(n) that is coprime to A000129(m) for all positive integers m < n.at n=30A308949
- Bisection of the odd-indexed Pell numbers A001853: part 2.at n=7A316709