90091

Appears in sequences

• Numbers n with property that n^2 starts and ends with 81.at n=13A159775
• Interpolation polynomial through n+1 points (0,1), (1,1), ..., (n-1,1) and (n,n) evaluated at 2n.at n=8A237664
• Row 3 of A328464: a(n) = A276156(8n - 4) / 6.at n=24A328466
• Constant term in the expansion of (1 + x^4 + y^4 + 1/(x*y))^n.at n=13A361700