40821

Appears in sequences

• Number of 1's in n-th term of A007651.at n=40A022466
• Numerators of continued fraction convergents to sqrt(589).at n=7A042128
• a(n) = (n+1)(n+2)(n+3)(35n^3 + 153n^2 + 232n + 120)/720.at n=8A107971
• a(n) = Sum_{i=1..n} Sum_{j=1..n} (-1)^(i+j) * (i+j)!/(2!*i!*j!).at n=10A307349
• Partial sums of A334136.at n=41A332264
• Self-convolution of n-th antidiagonal of the natural number array (so named in the Comments section of A000027).at n=10A387429