58220

Appears in sequences

• Irregular triangle read by rows: row n lists the rank sizes of the "electrical" poset EP_n of circular planar graphs with n boundary vertices.at n=78A232967
• a(n) is the number of permutations of length n that avoid the pattern 321 and the mesh pattern (12, 275) or the same sequence for the mesh patterns (12, 281), (12, 305), (12, 401).at n=11A289606