Number of length-n 0..4 arrays with no repeated value equal to the previous repeated value, with new values introduced in sequential order.
A268952
Number of length-n 0..4 arrays with no repeated value equal to the previous repeated value, with new values introduced in sequential order.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =12a(4) =40a(5) =153a(6) =634a(7) =2785a(8) =12634a(9) =58409a(10) =272738a(11) =1280233a(12) =6024682a(13) =28383609a(14) =133772018a(15) =630473513a(16) =2970963898a(17) =13996752665a(18) =65924951490a(19) =310433985929
External references
- oeis: A268952