19704

Appears in sequences

• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite CHI = Chiavennite Ca4Mn4[Be8Si20O52(OH)8].8H2O starting with a T4 atom.at n=15A019094
• a(0)=2. a(n) = the a(n-1)th integer from among those positive integers coprime to n.at n=19A125554
• a(n) = (n^3)/2 + (3*n^2)/2 + 3*n + 3.at n=32A127873
• Number of composite numbers between exponents of successive Mersenne primes.at n=28A157894
• Number T(n,k) of permutations of [n] with exactly k ascents from odd to even numbers; triangle T(n,k), n>=0, 0<=k<=floor(n/2), read by rows.at n=21A231777
• a(n) = n XOR n^3.at n=27A261807
• Number of loop-graphical integer partitions of 2n.at n=20A339656
• Number of integer partitions of n with no difference -2.at n=41A350842
• a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n+3*k,n-k).at n=6A378404