Number of (n+1) X (1+1) 0..2 arrays with no 2 X 2 subblock having the sum of its diagonal elements greater than the absolute difference of its antidiagonal elements.
A251081
Number of (n+1) X (1+1) 0..2 arrays with no 2 X 2 subblock having the sum of its diagonal elements greater than the absolute difference of its antidiagonal elements.
Terms
- a(0) =27a(1) =83a(2) =192a(3) =420a(4) =872a(5) =1782a(6) =3593a(7) =7215a(8) =14443a(9) =28891a(10) =57762a(11) =115486a(12) =230898a(13) =461692a(14) =923231a(15) =1846265a(16) =3692269a(17) =7384217a(18) =14768032a(19) =29535584a(20) =59070588a(21) =118140498a(22) =236280197a(23) =472559475a(24) =945117887a(25) =1890234567a(26) =3780467758a(27) =7560933970
External references
- oeis: A251081