Triangle read by rows: row n (n>=1) enumerates marked mesh patterns of type R_n^(2,0,2,0).
A211321
Triangle read by rows: row n (n>=1) enumerates marked mesh patterns of type R_n^(2,0,2,0).
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =116a(5) =4a(6) =632a(7) =80a(8) =8a(9) =3720a(10) =1056a(11) =240a(12) =24a(13) =23072a(14) =11680a(15) =4480a(16) =992a(17) =96
External references
- oeis: A211321