Number of essentially different ways of arranging numbers 1 through 2n around a circle so that the sum of each pair of adjacent numbers is prime and the odd (or even) numbers are in order.
A072616
Number of essentially different ways of arranging numbers 1 through 2n around a circle so that the sum of each pair of adjacent numbers is prime and the odd (or even) numbers are in order.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =8a(6) =2a(7) =5a(8) =18a(9) =2a(10) =9a(11) =100a(12) =80a(13) =224a(14) =567a(15) =200a(16) =225a(17) =2535a(18) =1573a(19) =10890a(20) =132651a(21) =34476a(22) =79768a(23) =319740a(24) =42282a(25) =257337a(26) =3445032a(27) =4274240a(28) =36781568a(29) =260272120
External references
- oeis: A072616