Number of n X 3 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 2 and every value increasing by 0 or 1 with every step right, diagonally se or down.
A252978
Number of n X 3 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 2 and every value increasing by 0 or 1 with every step right, diagonally se or down.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =33a(4) =266a(5) =851a(6) =1836a(7) =3221a(8) =5006a(9) =7191a(10) =9776a(11) =12761a(12) =16146a(13) =19931a(14) =24116a(15) =28701a(16) =33686a(17) =39071a(18) =44856a(19) =51041a(20) =57626a(21) =64611a(22) =71996a(23) =79781a(24) =87966a(25) =96551a(26) =105536a(27) =114921a(28) =124706a(29) =134891
External references
- oeis: A252978