225058680

Appears in sequences

• Number of polynomials of height n: a(1)=1, a(2)=1, a(3)=4, a(n) = 2*a(n-1) + a(n-2) + 2 for n >= 4.at n=22A005409
• a(n) = A000129(n) + (-1)^n.at n=23A111954
• Möbius transform of the Pell numbers (A000129).at n=22A133726
• a(n) = 6*a(n-1) - a(n-2) + 4 with n > 1, a(0)=0, a(1)=4.at n=11A182190
• G.f.: Sum_{n>=1} moebius(n)*x^n/(1 - A002203(n)*x^n + (-1)^n*x^(2*n)), where A002203 is the companion Pell numbers.at n=22A204385
• a(n) = A048739(n-1) mod A000129(floor(n/2)).at n=44A270708