4007712

Appears in sequences

• Triangle read by rows: T(n,k) is the number of partitions of the set {1,2,...,n} having k adjacent blocks of size 3, i.e., blocks of the form (i,i+1,i+2) (0 <= k <= floor(n/3)).at n=30A184176
• Number of set partitions of {1,2,...,n} having no blocks of the form {i,i+1,i+2}.at n=12A184177