Number of ways to pair up {1..2n} so sum of each pair is prime.
A000341
Number of ways to pair up {1..2n} so sum of each pair is prime.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =6a(4) =26a(5) =96a(6) =210a(7) =1106a(8) =3759a(9) =12577a(10) =74072a(11) =423884a(12) =2333828a(13) =16736611a(14) =99838851a(15) =630091746a(16) =4525325020a(17) =38848875650a(18) =342245714017
External references
- oeis: A000341