Number of nX2 nonnegative integer arrays with upper left 0 and lower right n+2-5 and value increasing by 0 or 1 with every step right or down.
A252970
Number of nX2 nonnegative integer arrays with upper left 0 and lower right n+2-5 and value increasing by 0 or 1 with every step right or down.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =13a(4) =61a(5) =192a(6) =483a(7) =1050a(8) =2058a(9) =3732a(10) =6369a(11) =10351a(12) =16159a(13) =24388a(14) =35763a(15) =51156a(16) =71604a(17) =98328a(18) =132753a(19) =176529a(20) =231553a(21) =299992a(22) =384307a(23) =487278a(24) =612030a(25) =762060a(26) =941265a(27) =1153971a(28) =1404963a(29) =1699516
External references
- oeis: A252970