Number of n X 2 0..2 arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once.
A268768
Number of n X 2 0..2 arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once.
Terms
- a(0) =3a(1) =12a(2) =32a(3) =100a(4) =248a(5) =620a(6) =1456a(7) =3380a(8) =7656a(9) =17148a(10) =37920a(11) =83140a(12) =180824a(13) =390796a(14) =839824a(15) =1796180a(16) =3825352a(17) =8116764a(18) =17165568a(19) =36195300a(20) =76118840a(21) =159694252a(22) =334301552a(23) =698429300a(24) =1456510888a(25) =3032326460a(26) =6303262176a(27) =13083742980
External references
- oeis: A268768