28161

Appears in sequences

• a(n) = T(0,n), array T given by A048505.at n=10A048506
• Expansion of g.f. (1-sqrt(1-4*x-4*x^2))/(2*(1+x)).at n=10A052709
• Triangle T(n,k) (n>=0, 0 <= k <= n) read by rows giving number of underdiagonal lattice paths from (0,0) to (n,k) using only steps R=(1,0), V=(0,1) and D=(1,2).at n=54A071943
• Triangle T(n,k) read by rows giving number of underdiagonal lattice paths from (0,0) to (n,k) using steps R=(1,0), V=(0,1) and D=(2,1).at n=53A071945
• Triangle T(n,k) read by rows giving number of underdiagonal lattice paths from (0,0) to (n,k) using steps R=(1,0), V=(0,1) and D=(2,1).at n=54A071945
• Triangle of numbers relating two simple context-free grammars (A052709 and A052705).at n=45A073152
• Triangle in A071943 with rows reversed.at n=45A108073
• Triangle in A071945 with rows reversed.at n=45A108075
• Triangle in A071945 with rows reversed.at n=46A108075
• Triangle of Schroeder paths counted by number of diagonal steps not preceded by an east step.at n=45A108916
• Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k UDUDU's (n >= 0; 0 <= k <= n-2 for n >= 2).at n=30A128753
• Record indices of A135727(n) = max{ A001281^k(n);k=0,1,2,3... } (3x-1 problem).at n=21A135728
• Record indices of A135727(n)/n = max{ A001281^k(n);k=0,1,2,3... }/n (3x-1 problem).at n=13A135729
• Riordan array (1, (A000045(x)/x-1) *A001006(A000045(x)/x-1) ).at n=36A187537
• Number of (n+1) X 4 0..1 arrays with the permanents of all 2 X 2 subblocks equal and nonzero.at n=6A204708
• Number of (n+1) X 8 0..1 arrays with the permanents of all 2 X 2 subblocks equal and nonzero.at n=2A204712
• T(n,k) is the number of (n+1) X (k+1) 0..1 arrays with the permanents of all 2 X 2 subblocks equal and nonzero.at n=38A204713
• T(n,k) is the number of (n+1) X (k+1) 0..1 arrays with the permanents of all 2 X 2 subblocks equal and nonzero.at n=42A204713
• Number of nX5 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j).at n=5A230649
• Number of nX6 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j).at n=4A230650