a(n) = permanent of the n-th principal submatrix of the rectangular array whose odd-numbered rows are (2,1,2,1,2,1,2,1,...) and even-numbered rows are (1,2,1,2,1,2,1,2,...).
A383212
a(n) = permanent of the n-th principal submatrix of the rectangular array whose odd-numbered rows are (2,1,2,1,2,1,2,1,...) and even-numbered rows are (1,2,1,2,1,2,1,2,...).
Terms
- a(0) =1a(1) =2a(2) =5a(3) =24a(4) =132a(5) =1032a(6) =8820a(7) =95616a(8) =1106496a(9) =15327360a(10) =223560000a(11) =3768768000a(12) =66305952000
External references
- oeis: A383212