Number of side-n hexagonal 0..2 arrays with values nondecreasing E, SW and SE.
A216931
Number of side-n hexagonal 0..2 arrays with values nondecreasing E, SW and SE.
Terms
- a(0) =3a(1) =53a(2) =1211a(3) =27768a(4) =618013a(5) =13312100a(6) =278398992a(7) =5675814840a(8) =113227696037
External references
- oeis: A216931