Number of (n+2) X 9 binary arrays with each 3 X 3 subblock having rows and columns in lexicographically nondecreasing order.

A184546

Number of (n+2) X 9 binary arrays with each 3 X 3 subblock having rows and columns in lexicographically nondecreasing order.

Terms

    a(0) =539a(1) =1513a(2) =3461a(3) =7307a(4) =14767a(5) =28844a(6) =54543a(7) =99872a(8) =177207a(9) =305112a(10) =510719a(11) =832788a(12) =1325583a(13) =2063717a(14) =3148137a(15) =4713439a(16) =6936723a(17) =10048219a(18) =14343937a(19) =20200617a(20) =28093279a(21) =38615698a(22) =52504155a(23) =70664842a(24) =94205327a(25) =124470514a(26) =163083563

External references