27894275208
domain: N
Appears in sequences
- a(n) = 8*3^n.at n=20A005051
- a(n) = number of (s(0), s(1), ..., s(n)) such that every s(i) is an integer, s(0) = 0, |s(i) - s(i-1)| = 1 for i = 1,2,3; |s(i) - s(i-1)| <= 1 for i >= 4. Also a(n) = sum of numbers in row n+1 of the array T defined in A026082 and a(n) = 24*3^(n-4) for n >= 4.at n=23A026097
- First differences of 9^n (A001019).at n=11A055275
- a(n) = (n-2)*(n-1)^n.at n=9A061250
- First differences of A003946.at n=22A080923
- a(n) = (8*3^n - 5*0^n)/3.at n=21A083583
- Number of palindromes of length n (in base 9).at n=20A117861
- Number of palindromes of length n (in base 9).at n=21A117861
- Coefficient of q^n in (1-q)^3/(1-3q); dimensions of the enveloping algebra of the derived free Lie algebra on 3 letters.at n=23A118264
- a(n) = n*(n-1)*9^n.at n=9A128803
- a(n) = (n/4)*3^(n/2)*((1+sqrt(3))^2+(-1)^n*(1-sqrt(3))^2).at n=36A187273
- Expansion of (1+3*x)^2/(1-3*x)^2.at n=18A236967