Number of North-East lattice paths from (0,0) to (n,n) that do not cross the diagonal y = x at any even point (2*k,2*k).
A376075
Number of North-East lattice paths from (0,0) to (n,n) that do not cross the diagonal y = x at any even point (2*k,2*k).
Terms
- a(0) =1a(1) =2a(2) =6a(3) =14a(4) =52a(5) =140a(6) =558a(7) =1598a(8) =6604a(9) =19588a(10) =82780a(11) =251212a(12) =1077992a(13) =3324760a(14) =14427422a(15) =45039422a(16) =197122524a(17) =621205076a(18) =2737289748a(19) =8691699524a(20) =38510822360a(21) =123045322024a(22) =547682980716
External references
- oeis: A376075