Number of 3 X 3 X 3 triangular 0..n arrays with no element lying outside the (possibly reversed) range delimited by its sw and se neighbors.
A214353
Number of 3 X 3 X 3 triangular 0..n arrays with no element lying outside the (possibly reversed) range delimited by its sw and se neighbors.
Terms
- a(0) =26a(1) =169a(2) =660a(3) =1951a(4) =4822a(5) =10507a(6) =20840a(7) =38421a(8) =66802a(9) =110693a(10) =176188a(11) =271011a(12) =404782a(13) =589303a(14) =838864a(15) =1170569a(16) =1604682a(17) =2164993a(18) =2879204a(19) =3779335a(20) =4902150a(21) =6289603a(22) =7989304a(23) =10055005a(24) =12547106a(25) =15533181a(26) =19088524a(27) =23296715a(28) =28250206
External references
- oeis: A214353