125370domain: NAppears in sequencesa(n) = Sum_{k=0..n-3} T(n,k)*T(n,k+3), T given by A026736.at n=7A027218Values of m such that N = (am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,57.at n=29A065697