Number of n X 3 0..2 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.
A201272
Number of n X 3 0..2 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =7a(4) =14a(5) =21a(6) =41a(7) =54a(8) =86a(9) =120a(10) =168a(11) =218a(12) =307a(13) =377a(14) =496a(15) =621a(16) =776a(17) =937a(18) =1177a(19) =1380a(20) =1676a(21) =1984a(22) =2344a(23) =2716a(24) =3221a(25) =3665a(26) =4260a(27) =4875a(28) =5570a(29) =6285
External references
- oeis: A201272