Number of n X 2 0..1 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

A281050

Number of n X 2 0..1 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

Terms

    a(0) =0a(1) =1a(2) =6a(3) =29a(4) =122a(5) =468a(6) =1686a(7) =5807a(8) =19338a(9) =62731a(10) =199264a(11) =622152a(12) =1914780a(13) =5821645a(14) =17515566a(15) =52221929a(16) =154461110a(17) =453654108a(18) =1324053522a(19) =3842768987a(20) =11096398578a(21) =31895230903a(22) =91296545404a(23) =260329675536a(24) =739725018360

External references