Number of n X 4 0..1 arrays with every element unequal to 0, 1 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A299591

Number of n X 4 0..1 arrays with every element unequal to 0, 1 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =5a(1) =5a(2) =11a(3) =23a(4) =53a(5) =121a(6) =250a(7) =533a(8) =1162a(9) =2490a(10) =5327a(11) =11465a(12) =24641a(13) =52882a(14) =113593a(15) =244046a(16) =524134a(17) =1125735a(18) =2418077a(19) =5193785a(20) =11155562a(21) =23961133a(22) =51466258a(23) =110544050a(24) =237437407a(25) =509992017a(26) =1095411137a(27) =2352832034a(28) =5053646321a(29) =10854722326

External references