42985

Appears in sequences

• a(n) = a(n-2) + 2*a(n-3) + a(n-4).at n=21A036605
• Trisection of A007294.at n=45A073470
• a(n) = a(n-2)+a(n-3)+a(n-4)+a(n-5)+2*a(n-6)+a(n-7).at n=26A109541
• Number of strict partitions of 2n that include a partition of n.at n=39A237258
• Expansion of x*(1 - x + 2*x^3 - x^4)/((1 - x)*(1 + x)*(1 - x + x^2)*(1 - x - x^2)).at n=23A279890
• a(n) = 2*a(n-1) - a(n-2) + a(n-4) for n>3, a(0)=0, a(1)=a(2)=2, a(3)=3.at n=23A286350
• a(n) = a(n-2) - 2*a(n-3) + a(n-4) for n>3, a(0)=0, a(1)=2, a(2)=-1, a(3)=3.at n=23A286390
• G.f. A(x) satisfies: A(x) = x * exp(2 * Sum_{k>=1} (-1)^k * A(x^k) / k).at n=8A345884
• a(n) = Sum_{k=0..n} (-1)^(n-k) * k^(k*(n-k)).at n=6A349894
• Lower (1/2)-midsequence of F(n) and F(n+4), where F = A000045 (Fibonacci numbers); see Comments.at n=21A390350