Number of nX2 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.
A304341
Number of nX2 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.
Terms
- a(0) =2a(1) =4a(2) =14a(3) =28a(4) =94a(5) =284a(6) =752a(7) =2244a(8) =6532a(9) =18472a(10) =53680a(11) =155040a(12) =445000a(13) =1285184a(14) =3706032a(15) =10672592a(16) =30778032a(17) =88725600a(18) =255701024a(19) =737147264a(20) =2124889120a(21) =6124798656a(22) =17655444096a(23) =50892739392a(24) =146699089600a(25) =422869223040
External references
- oeis: A304341