Number of n X 2 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two exactly once.
A268633
Number of n X 2 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two exactly once.
Terms
- a(0) =3a(1) =24a(2) =120a(3) =504a(4) =1944a(5) =7128a(6) =25272a(7) =87480a(8) =297432a(9) =997272a(10) =3306744a(11) =10865016a(12) =35429400a(13) =114791256a(14) =369882936a(15) =1186176312a(16) =3788111448a(17) =12053081880a(18) =38225488248a(19) =120875192568a(20) =381221761176
External references
- oeis: A268633