33929305

Appears in sequences

• a(0)=1, a(1)=1, a(2)=1, a(n) = 2*a(n-1) + a(n-2) + 1.at n=21A033539
• a(n) = 6*a(n-1) - a(n-2) + 2, with a(0)=1, a(1)=4.at n=10A072221
• Expansion of (5-x^2)/((1+x)*(1-6*x+x^2)).at n=9A098212
• Numbers k such that the distance between the k-th triangular number and the nearest square is at most 1.at n=38A229083
• Numbers k such that the distance between the k-th triangular number and the nearest square is exactly 1.at n=29A229131
• a(0)=1, a(1)=25, a(2)=865; a(n) = 35*(a(n-1)-a(n-2))+a(n-3).at n=5A350983