Number of (n+3) X 1 arrays of occupancy after each element moves up to +-3 places but not 0.

A222550

Number of (n+3) X 1 arrays of occupancy after each element moves up to +-3 places but not 0.

Terms

    a(0) =31a(1) =102a(2) =359a(3) =1279a(4) =4537a(5) =15929a(6) =56041a(7) =197313a(8) =694561a(9) =2443809a(10) =8598567a(11) =30254246a(12) =106446779a(13) =374510087a(14) =1317616614a(15) =4635657529a(16) =16309130459a(17) =57378359687a(18) =201866467555a(19) =710197956209

External references