21624372014
domain: N
Appears in sequences
- Companion Pell numbers: a(n) = 2*a(n-1) + a(n-2), a(0) = a(1) = 2.at n=27A002203
- A continued cotangent.at n=3A006266
- Numerators of continued fraction convergents to sqrt(8).at n=26A041010
- Numerators of continued fraction convergents to sqrt(200).at n=8A041370
- Numbers k such that (k^2 + 4)/2 is a square.at n=13A077444
- a(n) = floor((1+sqrt(2))^n).at n=27A080039
- a(n) = 14*a(n-1) + a(n-2), starting with a(0) = 2 and a(1) = 14.at n=9A090300
- Expansion of (1+x^2)/(1-2*x-x^2).at n=27A099425
- a(n) = -(u^n-1)*(v^n-1) with u = 1+sqrt(2), v = 1-sqrt(2).at n=26A129744
- Continued cotangent recurrence a(n+1)=a(n)^3+3*a(n) and a(1)=14.at n=2A145188
- a(1) = 2, a(2) = 8; a(n) = 2 a(n - 1) + a(n - 2) - 4*(n mod 2).at n=26A162484
- a(n) = n*(n^2 + 3)*(n^6 + 6*n^4 + 9*n^2 + 3).at n=14A261574