183921

Appears in sequences

• Triangular numbers containing 2k digits in which the sum of the first k digits = that of the rest.at n=14A068898
• a(n) = p*(p-1)/2, where p is A000043(n).at n=13A139116
• Number of (n+1) X (1+1) 0..1 arrays with nondecreasing max(x(i,j),x(i,j-1)) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.at n=12A250576