Number of n X 3 integer arrays with each element equal to the number of horizontal and antidiagonal neighbors less than or equal to itself.
A266050
Number of n X 3 integer arrays with each element equal to the number of horizontal and antidiagonal neighbors less than or equal to itself.
Terms
- a(0) =2a(1) =12a(2) =20a(3) =54a(4) =120a(5) =284a(6) =660a(7) =1540a(8) =3592a(9) =8376a(10) =19536a(11) =45560a(12) =106256a(13) =247808a(14) =577936a(15) =1347856a(16) =3143456a(17) =7331136a(18) =17097600a(19) =39874848a(20) =92995712a(21) =216883648a(22) =505813824a(23) =1179653824a(24) =2751176576a(25) =6416265856a(26) =14963949568a(27) =34898770048a(28) =81390554368
External references
- oeis: A266050