11453245440domain: NAppears in sequencesExpansion of 1/((1-2*x)*(1-8*x)).at n=11A016131a(n) = 10*a(n-2) - 16*a(n-4) for n>=4, with a(0)=a(1)=1, a(2)=6, a(3)=10.at n=23A083333a(n) is the smallest tetrahedral number with exactly n prime factors (counted with multiplicity), or -1 if no such number exists.at n=17A358927