Number of n X 3 nonnegative integer arrays with upper left 0 and lower right n+3-6 and value increasing by 0 or 1 with every step right or down.
A252925
Number of n X 3 nonnegative integer arrays with upper left 0 and lower right n+3-6 and value increasing by 0 or 1 with every step right or down.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =33a(4) =413a(5) =2859a(6) =13976a(7) =54199a(8) =177848a(9) =513905a(10) =1342933a(11) =3233784a(12) =7275049a(13) =15451358a(14) =31234528a(15) =60485192a(16) =112793064a(17) =203424686a(18) =356097793a(19) =606862907a(20) =1009447181a(21) =1642504781a(22) =2619324320a(23) =4100669333a(24) =6311574992a(25) =9563095895
External references
- oeis: A252925