Number of n X 2 0..1 arrays with no element unequal to a strict majority of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
A280174
Number of n X 2 0..1 arrays with no element unequal to a strict majority of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
Terms
- a(0) =1a(1) =2a(2) =12a(3) =41a(4) =103a(5) =263a(6) =656a(7) =1618a(8) =3931a(9) =9459a(10) =22557a(11) =53395a(12) =125594a(13) =293796a(14) =683972a(15) =1585588a(16) =3661900a(17) =8428646a(18) =19341455a(19) =44261305a(20) =101034472a(21) =230100558a(22) =522936849a(23) =1186138105a(24) =2685582035a(25) =6070360107a(26) =13699764020a(27) =30873005212a(28) =69478759648
External references
- oeis: A280174