Number of (n+1)X(2+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise.

A235407

Number of (n+1)X(2+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise.

Terms

    a(0) =44a(1) =172a(2) =704a(3) =2302a(4) =7617a(5) =21707a(6) =62070a(7) =160219a(8) =413728a(9) =994013a(10) =2386992a(11) =5442827a(12) =12403299a(13) =27224435a(14) =59728771a(15) =127521907a(16) =272186909a(17) =569643759a(18) =1192017901a(19) =2459436721a(20) =5074257282a(21) =10364928156a(22) =21172231949a(23) =42946541188a(24) =87117681967

External references