2744209

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=17A005409
• Expansion of g.f. (1+8*x-x^2)/((1+x)*(1-6*x+x^2)).at n=8A105058
• Row sums of triangle in A152719.at n=32A238375