40137

Appears in sequences

• Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite LIO = Liottite (Ca,Na2,K2)9[Al18Si18O72] starting with a T3 atom.at n=6A019029
• a(n) = Sum_{k=0..floor(2*n/3)} (k+1) * binomial(k,2*n-3*k).at n=23A392267