317733228541
domain: N
Appears in sequences
- a(n) = (9^n - 1)/8.at n=13A002452
- Numerators of central difference coefficients M_{3}^(2n+1).at n=12A002673
- Coloring a circuit with 4 colors.at n=25A006342
- Cyclotomic polynomials at x=9.at n=13A019327
- Gaussian binomial coefficients [ n,12 ] for q = 9.at n=1A022263
- Base-3 digits are, in order, the first n terms of the periodic sequence with initial period 1,0.at n=24A033113
- a(n) = Sum_{j=0..12} n^j.at n=9A060887
- a(n) = Sum_{k=0..floor(n/2)} binomial(n-k, k-1)*2^(n-k-1)*(3/2)^(k-1).at n=26A099583
- If n mod 2 = 0 then (3^(n+3)-19)/8 else (3^(n+3)-1)/8.at n=23A116973
- a(n) = (3^n-1)/2 if n odd, (3^n-1)/8 if n even.at n=26A152298
- A threes sequence that gets more even factors out: a(n) = (3^n - 1)*(3^n + 1)/2^(4 - (n mod 2)).at n=13A152299
- Cipolla pseudoprimes to base 3: (9^p-1)/8 for any odd prime p.at n=4A210461
- Fermat pseudoprimes to base 3 of the form (3^(4*k + 2) - 1)/8.at n=5A217853
- Expansion of 1/((x-1)*(3*x-1)*(3*x^2+1)).at n=24A239577
- a(n) = p(0,n), where p(x,n) is the strong divisibility sequence of polynomials based on sqrt(3) as in A327321.at n=25A329008
- Triangular numbers that are palindromes in base 3.at n=25A350990
- Cogrowth sequence of the 16-element Pauli group C4 o D4 = <S,T,U | s^4, T^2, U^2, S^2(TU)^2, [S,T], [S,U]>.at n=13A377943