80641778674domain: NAppears in sequencesBisection of tribonacci numbers.at n=22A099463Semiprime tribonacci numbers.at n=4A101758a(n) = 7*a(n-1) - 5*a(n-2) + a(n-3), with initial values a(0) = a(1) = 1, a(2)=4.at n=15A192806Tribonacci numbers which can be written in the form a^2 + b^2.at n=15A216670