Number of (n+1) X (2+1) 0..1 arrays with no 2 X 2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements.

A251122

Number of (n+1) X (2+1) 0..1 arrays with no 2 X 2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements.

Terms

    a(0) =21a(1) =40a(2) =69a(3) =117a(4) =193a(5) =315a(6) =510a(7) =823a(8) =1326a(9) =2136a(10) =3442a(11) =5550a(12) =8955a(13) =14458a(14) =23355a(15) =37743a(16) =61015a(17) =98661a(18) =159564a(19) =258097a(20) =417516a(21) =675450a(22) =1092784a(23) =1768032a(24) =2860593a(25) =4628380a(26) =7488705a(27) =12116793a(28) =19605181a(29) =31721631

External references