21933

Appears in sequences

• a(n) is the n-th diagonal sum of left justified array T given by A027960.at n=31A027975
• Triangle read by rows giving numbers of paths in a lattice satisfying certain conditions.at n=63A071944
• Triangle in A071944 with rows reversed.at n=57A108074
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 0), (-1, 0, -1), (1, -1, -1), (1, 1, 1)}.at n=9A149497
• Constant term of the reduction by x^2->x+2 of the polynomial p(n,x)=1+x^n+x^(2n).at n=7A192465
• Number of nX6 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value 2-x(i,j).at n=1A230673
• T(n,k)=Number of nXk 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value 2-x(i,j).at n=22A230675
• Number of 2 X n 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value 2-x(i,j).at n=5A230676
• Number of nonnegative integers with property that their base 9/5 expansion (see A024653) has n digits.at n=14A245430
• The number of maximal subsemigroups of the Jones monoid on the set [1..n].at n=21A290140