564859072961domain: NAppears in sequencesa(0)=1, a(n) = 3*a(n-1) + 2; a(n) = 2*3^n - 1.at n=24A0484732*3^n-(-1)^n.at n=24A081632A048473 prefixed by two zeros.at n=26A154992a(n) = 2*9^n-1.at n=12A198859