512706121226
domain: N
Appears in sequences
- a(0) = 1, a(1) = 2, a(n) = 4*a(n-1) - a(n-2).at n=21A001075
- Related to Genocchi numbers.at n=21A002317
- Numerators of continued fraction convergents to sqrt(27).at n=13A041042
- Numerators of continued fraction convergents to sqrt(75).at n=27A041132
- Numerators of continued fraction convergents to sqrt(675).at n=13A042298
- a(n) = 14*a(n-1) - a(n-2); a(0) = a(1) = 2.at n=11A094347
- a(n) = 2702*a(n-1) - a(n-2); a(-1) = a(0) = 26.at n=4A094835
- x such that x^2 - 27*y^2 = 1.at n=7A114052
- Even numbers k such that k^2 - 1 is a powerful number.at n=4A365983