Number of n X 3 arrays with every diagonal and antidiagonal of length L containing a permutation of 1..L.
A179808
Number of n X 3 arrays with every diagonal and antidiagonal of length L containing a permutation of 1..L.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =9a(4) =12a(5) =25a(6) =60a(7) =121a(8) =220a(9) =441a(10) =924a(11) =1849a(12) =3612a(13) =7225a(14) =14620a(15) =29241a(16) =58140a(17) =116281a(18) =233244a(19) =466489a(20) =931612a(21) =1863225a(22) =3729180a(23) =7458361a(24) =14911260a(25) =29822521a(26) =59655964a(27) =119311929a(28) =238602012a(29) =477204025
External references
- oeis: A179808