1721856

Appears in sequences

• a(n+1) = 4*(a(n)+a(n-1)) for n>1, a(1)=1, a(2)=6.at n=10A108051
• Number of skew Dyck paths of semilength n having no DD's.at n=14A128739
• Expansion of (1 + 6*x - 12*x^2 - 8*x^3)/(1 - 24*x^2 + 16*x^4).at n=9A164584