102490

Appears in sequences

• Second elementary symmetric function of the first n terms of (2,2,3,3,4,4,5,5...).at n=38A203299
• a(n) is the number of arches for semi-meanders with n top arches that have exactly two covering arches.at n=12A322507
• Numbers of facially complete 2-connected planar embeddings.at n=12A375617