Number of nX2 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally.
A232289
Number of nX2 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally.
Terms
- a(0) =3a(1) =15a(2) =73a(3) =355a(4) =1727a(5) =8401a(6) =40867a(7) =198799a(8) =967065a(9) =4704323a(10) =22884351a(11) =111321761a(12) =541528771a(13) =2634286479a(14) =12814582761a(15) =62337005731a(16) =303240640447
External references
- oeis: A232289