Number of n X 2 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two exactly once.
A268792
Number of n X 2 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two exactly once.
Terms
- a(0) =3a(1) =22a(2) =78a(3) =234a(4) =652a(5) =1714a(6) =4360a(7) =10820a(8) =26366a(9) =63346a(10) =150482a(11) =354196a(12) =827310a(13) =1919884a(14) =4430664a(15) =10175910a(16) =23272918a(17) =53029498a(18) =120435100a(19) =272714858a(20) =615904208a(21) =1387638220a(22) =3119557838a(23) =6999162874a(24) =15675003042a(25) =35046218020
External references
- oeis: A268792