Number of (n+3)X1 arrays of occupancy after each element moves up to +-3 places but not 0 and without 2-loops.
A222161
Number of (n+3)X1 arrays of occupancy after each element moves up to +-3 places but not 0 and without 2-loops.
Terms
- a(0) =13a(1) =57a(2) =205a(3) =733a(4) =2627a(5) =9305a(6) =32576a(7) =113448a(8) =394406a(9) =1369551a(10) =4750768a(11) =16468347a(12) =57064823a(13) =197691644a(14) =684764755a(15) =2371639753a(16) =8213463074a(17) =28443621204a(18) =98498816070a(19) =341089856906
External references
- oeis: A222161