285124

Appears in sequences

• Triangle read by rows: number of meanders filling out an n X k grid, unreduced for symmetry.at n=32A201145
• Number of 4 X n binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing.at n=9A266430
• Start with a 2 X n array of squares, join every vertex on top edge to every vertex on bottom edge; a(n) = one-half the number of cells.at n=43A355902