159460
domain: N
Appears in sequences
- Formed from a secondary diagonal of triangle A096542 where a(n) = A096542(n,n-2)/3.at n=6A096543
- Number of irreducible involutions of length n avoiding the pattern {123}.at n=18A278025
- Triangle read by rows: The d-th row contains the Betti numbers of the d-dimensional resonance arrangement.at n=18A344494