120285

Appears in sequences

• A convolution triangle of numbers obtained from A036068.at n=36A030524
• Expansion of (-1+1/(1-3*x)^3)/(9*x).at n=8A036068
• Odd numbers divisible by exactly 9 primes (counted with multiplicity).at n=10A046322
• Expansion of 1/(1 - 9*x)^9.at n=3A053108
• a(n) = 3*a(n-1) - 3*a(n-2) + 3*a(n-3), with a(0)=1, a(1)=3, a(2)=1.at n=19A136297
• Numbers of the form A000217(n)*A007494(n) that are divisible by 3.at n=45A295867
• a(n) = floor(-(3/2)*a(n-1)), a(1)=-2.at n=27A333588
• a(n) = (4*n)!/((2*n)!*(n)!) * (n/3)!/(4*n/3)!.at n=4A347855