Number of permutations of 1..2n in which the sum of every two adjacent elements is a prime number, including the sum of first and last elements.
A125712
Number of permutations of 1..2n in which the sum of every two adjacent elements is a prime number, including the sum of first and last elements.
Terms
- a(0) =2a(1) =8a(2) =12a(3) =32a(4) =960a(5) =12288a(6) =40320a(7) =1296384a(8) =13862592a(9) =126186000a(10) =4703871392a(11) =153495217056
External references
- oeis: A125712