70917

Appears in sequences

• a(n) = T(n) concatenated with reverse(T(n)) divided by 11, where T(n) is the n-th triangular number.at n=39A084008
• Expansion of (x^2 + x - 1)/((1 - x)*(2*x^2 + 3*x - 1)). Row sums of A371300.at n=9A371301