435848050
domain: N
Appears in sequences
- a(n) = (9^n - 1)/8.at n=10A002452
- Coloring a circuit with 4 colors.at n=19A006342
- Gaussian binomial coefficients [ n,9 ] for q = 9.at n=1A022260
- a(n) = Sum_{k=0..n} n^k.at n=9A031973
- Base-3 digits are, in order, the first n terms of the periodic sequence with initial period 1,0.at n=18A033113
- Numbers of the form (9^{mr}-1)/(9^r-1) for positive integers m, r.at n=23A076288
- a(n) = Sum_{k=0..floor(n/2)} binomial(n-k, k-1)*2^(n-k-1)*(3/2)^(k-1).at n=20A099583
- a(n) = n^9 + n^8 + n^7 + n^6 + n^5 + n^4 + n^3 + n^2 + n + 1.at n=9A103623
- Row sums in A112668.at n=9A110737
- If n mod 2 = 0 then (3^(n+3)-19)/8 else (3^(n+3)-1)/8.at n=17A116973
- a(n) = (3^n-1)/2 if n odd, (3^n-1)/8 if n even.at n=20A152298
- Expansion of 1/((x-1)*(3*x-1)*(3*x^2+1)).at n=18A239577
- Triangular numbers that are palindromes in base 3.at n=15A350990
- Triangular numbers that are palindromes in base 9.at n=33A350993