Number of ways to select 15 knights from n knights sitting at a round table if no adjacent knights are chosen.

A188225

Number of ways to select 15 knights from n knights sitting at a round table if no adjacent knights are chosen.

Terms

    a(0) =2a(1) =31a(2) =256a(3) =1496a(4) =6936a(5) =27132a(6) =93024a(7) =286824a(8) =810084a(9) =2124694a(10) =5230016a(11) =12183560a(12) =27041560a(13) =57500460a(14) =117675360a(15) =232676280a(16) =445962870a(17) =830905245a(18) =1508593920a(19) =2674776720a(20) =4639918800a(21) =7887861960a(22) =13160496960a(23) =21578373360a(24) =34810394760

External references