Number of ways of arranging the numbers 1 ... 2n into a 2 X n array so there is exactly one local maximum.
A087923
Number of ways of arranging the numbers 1 ... 2n into a 2 X n array so there is exactly one local maximum.
Terms
- a(0) =2a(1) =16a(2) =208a(3) =3584a(4) =76544a(5) =1947648a(6) =57477120a(7) =1929117696a(8) =72545402880
External references
- oeis: A087923