Number of (n+4)X1 arrays of occupancy after each element moves up to +-4 places but not 0.
A222551
Number of (n+4)X1 arrays of occupancy after each element moves up to +-4 places but not 0.
Terms
- a(0) =121a(1) =427a(2) =1562a(3) =5761a(4) =21239a(5) =78245a(6) =287858a(7) =1059674a(8) =3901868a(9) =14366833a(10) =52894813a(11) =194725954a(12) =716822517a(13) =2638639647a(14) =9712504051a(15) =35749337667a(16) =131581046318a(17) =484294944395
External references
- oeis: A222551