1751011099

Appears in sequences

• a(n)*a(n+3) - a(n+1)*a(n+2) = 5, given a(0)=a(1)=1, a(2)=2.at n=20A080873
• Numbers k > 0 such that k^2 is a centered triangular number.at n=19A129445
• a(n) = 10*a(n-1) - a(n-2).at n=10A140781