For n >= 2, a(n) is the number of slim rectangular diagrams of length n.

A273596

For n >= 2, a(n) is the number of slim rectangular diagrams of length n.

Terms

    a(0) =1a(1) =3a(2) =9a(3) =32a(4) =139a(5) =729a(6) =4515a(7) =32336a(8) =263205a(9) =2401183a(10) =24275037a(11) =269426592a(12) =3257394143a(13) =42615550453a(14) =599875100487

External references