Number of n X 2 0..1 arrays with every repeated value in every row and column greater than or equal to the previous repeated value.

A267729

Number of n X 2 0..1 arrays with every repeated value in every row and column greater than or equal to the previous repeated value.

Terms

    a(0) =4a(1) =16a(2) =64a(3) =225a(4) =784a(5) =2601a(6) =8464a(7) =26896a(8) =84100a(9) =259081a(10) =788544a(11) =2374681a(12) =7086244a(13) =20976400a(14) =61653904a(15) =180069561a(16) =522945424a(17) =1510954641a(18) =4345446400a(19) =12444741136a(20) =35502850084a(21) =100926300721a(22) =285976813824a(23) =807886380625

External references