Number of n X 3 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 3 and every value within 3 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down.
A252999
Number of n X 3 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 3 and every value within 3 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =34a(5) =279a(6) =1028a(7) =2601a(8) =5318a(9) =9499a(10) =15464a(11) =23533a(12) =34026a(13) =47263a(14) =63564a(15) =83249a(16) =106638a(17) =134051a(18) =165808a(19) =202229a(20) =243634a(21) =290343a(22) =342676a(23) =400953a(24) =465494a(25) =536619a(26) =614648a(27) =699901a(28) =792698a(29) =893359
External references
- oeis: A252999