-4094

Appears in sequences

• a(n) = 4*a(n-2) - a(n-1), with a(0)=1, a(1)=-2.at n=9A122112
• a(0)=1, a(n) = 2 - 2^(n-1) for n>0.at n=13A122958
• a(n) = A163659(n^2), where A163659 is the logarithmic derivative of Stern's diatomic series (A002487).at n=95A195587
• The infinite Seidel matrix H read by antidiagonals upwards; H = (H(n,k): n,k >= 0).at n=48A236935
• a(n) = A294898(A122111(n)).at n=73A323167
• G.f. satisfies A(x) = 1 + x/(1 + x^4) * A(x/(1 + x^4)).at n=18A360899