1985837462

Appears in sequences

• Number of nX5 -1,1 arrays such that the sum over i=1..n,j=1..5 of i*x(i,j) is zero, the sum of x(i,j) is zero, and rows are nondecreasing (number of ways to distribute 5-across galley oarsmen left-right at n fore-aft positions so that there are no turning moments on the ship).at n=15A225341