Number of (n+1)X2 0..2 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards.
A204223
Number of (n+1)X2 0..2 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards.
Terms
- a(0) =81a(1) =450a(2) =2500a(3) =11100a(4) =49284a(5) =192474a(6) =751689a(7) =2707641a(8) =9753129a(9) =33291180a(10) =113635600a(11) =373782240a(12) =1229484096a(13) =3940246872a(14) =12627691129a(15) =39725765841a(16) =124974269289a(17) =387960161310
External references
- oeis: A204223