96937domain: NAppears in sequencesa(n+3) = a(n+2) + 3a(n+1) - 2a(n); a(0) = 1, a(1) = -1, a(2)= 3.at n=19A104005Main diagonal of Unlucky array: a(n) = A255543(n,n).at n=48A255549Number of non-abelian groups of order prime(n)^6.at n=39A271811