194940

Appears in sequences

• a(n) = n^2*(n+1)^2*(n+2)/12.at n=18A004302
• a(n) = floor(n/2) * floor((n-1)/2) * floor((n-2)/2) * floor((n-3)/2) * floor((n-4)/2) / 12.at n=40A028725
• Numbers k such that 2^k - k + 1 is prime.at n=20A100361