2691559000

Appears in sequences

• Real part of Product_{k = 0..n} (1 + k*i), i = sqrt(-1).at n=13A105750
• Define u(n) as in A220448; then a(1)=1, thereafter a(n) = u(n)*a(n-1).at n=12A220449
• Imaginary part of Product_{k = 1..n} (k + i), i = sqrt(-1).at n=13A231531