26658145586
domain: N
Appears in sequences
- First member of the Diophantine pair (m,k) that satisfies 5*(m^2 + m) = k^2 + k; a(n) = m.at n=17A077259
- a(n) = F(3) + F(6) + F(9) + ... + F(3n), F(n) = Fibonacci numbers A000045.at n=17A099919
- Define a(1)=0, a(2)=2 then a(n) = 3*a(n-1) - a(n-2), a(n+1) = 3*a(n)-a(n-1) and a(n+2) = 3*a(n+1) - a(n) + 2.at n=25A105073
- Antidiagonal sums of number triangle A086645.at n=26A108479
- Expansion of (1-x)^3/(1-4x+5x^2-4x^3+x^4).at n=26A109961
- a(n+3) = 3*a(n+2) + 5*a(n+1) + a(n), a(0) = 1, a(1) = 2, a(2) = 11.at n=17A110679
- x-values in the solutions to x^2 + x = 5*y^2 + y.at n=9A257939