46384

Appears in sequences

• Number of rooted generalized quadrangular dissections of weight n of a closed disk: planar maps having the external face bounded by a polygon and all internal faces of size 4.at n=7A090376
• Number of (n+1) X 4 0..1 arrays with the number of rightwards and downwards edge increases in each 2 X 2 subblock equal to the number in all its horizontal and vertical neighbors.at n=28A206262
• Number of distinct ways to erect n semicircles of distinct diameters in [n] on the number line from 1 to 2n using 2 colors where all semicircles of the same color are mutually noncrossing. Two ways are regarded the same if the number line is reversed or the colors are exchanged.at n=16A375254
• a(n) = (1/4) * Sum_{k=0..floor(n/2)} (k+2) * 2^k * binomial(2*k+2,2*n-4*k+1).at n=12A391833