Number of 3 X 3 X 3 triangular nonnegative integer arrays with all sums of an element and its neighbors <= n.
A166189
Number of 3 X 3 X 3 triangular nonnegative integer arrays with all sums of an element and its neighbors <= n.
Terms
- a(0) =1a(1) =7a(2) =29a(3) =90a(4) =232a(5) =524a(6) =1072a(7) =2030a(8) =3613a(9) =6111a(10) =9905a(11) =15484a(12) =23464a(13) =34608a(14) =49848a(15) =70308a(16) =97329a(17) =132495a(18) =177661a(19) =234982a(20) =306944a(21) =396396a(22) =506584a(23) =641186a(24) =804349a(25) =1000727a(26) =1235521a(27) =1514520a(28) =1844144a(29) =2231488
External references
- oeis: A166189