4368100

Appears in sequences

• a(1) = 0, then smallest square such that a(n+1) - a(n) is a palindrome.at n=16A075056
• a(n) = A001609(n)^2, where g.f. of A001609 is x*(1+3*x^2)/(1-x-x^3).at n=19A218439