191808

Appears in sequences

• a(0) = 1; for n>0, a(n) = 16 times sum of cubes of divisors of n.at n=22A092820
• a(n) = A110722(n)/121.at n=36A110723
• Number of 3 X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 1 vertically.at n=12A207694
• Number of (w,x,y,z) with all terms in {1,...,n} and w<2x and y<=2z.at n=24A212507
• Number of integers less than 10^n which are not divisible by any of the first n primes.at n=5A215671
• Triangle T(n,r) read by rows: order of the semigroup of orientation-preserving partial transformations of n elements with breath r.at n=43A289710
• a(n) is the least integer m such that A047994(m) = ((n-2)/n)*m where A047994 is the unitary totient function, or 0 if there is no such m.at n=34A319313
• a(n) = Sum_{k=0..n} 2^k * A000041(k) * A000009(n-k).at n=11A347829