Number of nX4 0..1 arrays with every element unequal to 0, 1, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A318033
Number of nX4 0..1 arrays with every element unequal to 0, 1, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =5a(1) =11a(2) =25a(3) =69a(4) =176a(5) =472a(6) =1222a(7) =3354a(8) =9209a(9) =25092a(10) =69048a(11) =189937a(12) =522701a(13) =1439639a(14) =3967466a(15) =10934482a(16) =30136689a(17) =83080184a(18) =229038227a(19) =631457554a(20) =1741022135a(21) =4800335088a(22) =13235718591a(23) =36494509188a(24) =100626366718a(25) =277458546176
External references
- oeis: A318033