Number of nX3 -2..2 arrays of 2X2 subblock diagonal sums minus antidiagonal sums for some (n+1)X4 binary array with rows and columns of the latter in lexicographically nondecreasing order.
A227057
Number of nX3 -2..2 arrays of 2X2 subblock diagonal sums minus antidiagonal sums for some (n+1)X4 binary array with rows and columns of the latter in lexicographically nondecreasing order.
Terms
- a(0) =20a(1) =124a(2) =643a(3) =2934a(4) =11810a(5) =42295a(6) =136553a(7) =402898a(8) =1099681a(9) =2805516a(10) =6748051a(11) =15412421a(12) =33626114a(13) =70430760a(14) =142218700a(15) =277853319a(16) =526833214a(17) =972034792a(18) =1749218167a(19) =3076360168a(20) =5297051430a(21) =8943742393a(22) =14828643583a(23) =24172697248
External references
- oeis: A227057