241805655

Appears in sequences

• Expansion of 1/(1 - 3*x)^4; 4-fold convolution of A000244 (powers of 3).at n=12A036216
• Expansion of 1/(1-3*x)^5; 5-fold convolution of A000244 (powers of 3).at n=11A036217
• a(n) = 3*a(n-1) + 18*a(n-2), a(0)=0, a(1)=1.at n=12A080424
• a(n) = 3^n*tetranacci(n) or (2^n)*A001648(n).at n=10A127220
• Denominators of exponential expansion of (3/(2*log(1+x)))*(1 - 1/(1+x)^(2/3)).at n=12A284863
• a(n) = p(2,n), where p(x,n) is the strong divisibility sequence of polynomials based on sqrt(2) as in A327320.at n=11A329007