Number of 0..3 arrays of length n with no adjacent pair equal to its immediately preceding adjacent pair, and new values introduced in 0..3 order.
A212824
Number of 0..3 arrays of length n with no adjacent pair equal to its immediately preceding adjacent pair, and new values introduced in 0..3 order.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =43a(5) =152a(6) =559a(7) =2091a(8) =7882a(9) =29809a(10) =112895a(11) =427824a(12) =1621691a(13) =6147791a(14) =23307226a(15) =88363077a(16) =335007715a(17) =1270107208a(18) =4815336407a(19) =18256317315a(20) =69214939274a(21) =262413734345a(22) =994885963543
External references
- oeis: A212824