Number of ways to pair up {2..2n+1} so the sum of each pair is prime.

A134293

Number of ways to pair up {2..2n+1} so the sum of each pair is prime.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =60a(6) =190a(7) =764a(8) =2337a(9) =9812a(10) =49538a(11) =330058a(12) =2133438a(13) =11192143a(14) =73469550a(15) =462692414a(16) =3692965270a(17) =32635321384a(18) =290171883863

External references