-1999

Appears in sequences

• a(n) = 7^n - n^11.at n=2A024086
• A symmetrical triangle sequence:q=3:t(n,m,q)=(1 - q^n)*Eulerian[n + 1, m] - (1 - q^n) + 1.at n=11A174729
• A symmetrical triangle sequence:q=3:t(n,m,q)=(1 - q^n)*Eulerian[n + 1, m] - (1 - q^n) + 1.at n=13A174729
• a(n) = 2*n^3 - 163*n^2 + 2777*n - 11927.at n=17A218458
• a(1)=0; thereafter a(n) = (n-1)*sigma(n)-n*sigma(n-1) where sigma is the sum-of-divisors function A000203.at n=36A335153