Number of (n+1) X (1+1) 0..2 arrays with the upper median of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one.
A237630
Number of (n+1) X (1+1) 0..2 arrays with the upper median of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one.
Terms
- a(0) =81a(1) =260a(2) =702a(3) =1786a(4) =4621a(5) =11936a(6) =30656a(7) =77576a(8) =200452a(9) =515424a(10) =1325424a(11) =3365664a(12) =8687760a(13) =22278912a(14) =57336960a(15) =145904256a(16) =376379712a(17) =963592704a(18) =2481143040a(19) =6321940992a(20) =16301843712a(21) =41692741632a(22) =107387375616a(23) =273842325504
External references
- oeis: A237630