3443737680domain: NAppears in sequencesa(n) = 3^n * n*(n + 1).at n=15A116138Number of isolated 0's in all ternary words of length n on {0,1,2}.at n=18A120926Number of permutations of 8 indistinguishable copies of 1..n arranged in a circle with exactly 1 local maximum.at n=8A159739Partial products of A007425.at n=13A175596