Number of nonnegative integer arrays of length n+7 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value 4.
A211844
Number of nonnegative integer arrays of length n+7 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value 4.
Terms
- a(0) =1a(1) =9a(2) =56a(3) =286a(4) =1302a(5) =5486a(6) =21897a(7) =84003a(8) =312864a(9) =1139408a(10) =4079404a(11) =14417732a(12) =50465519a(13) =175400683a(14) =606660198a(15) =2091805472a(16) =7201476498a(17) =24786314450a(18) =85384391951a(19) =294672813537
External references
- oeis: A211844