A027148 a(n) = A027144(2n-1, n-1).

1, 6, 20, 152, 528, 4416, 15488, 135552, 477440, 4289536, 15144960, 138407936, 489431040, 4526702592, 16024403968, 149528084480, 529747476480, 4977103994880, 17643662213120, 166668216041472, 591119702294528, 5608619676532736

Offset

1,2

Links

Table of n, a(n) for n=1..22.

Crossrefs

Sequence in context: A000387 A145221 A332391 * A095854 A027268 A000388

Adjacent sequences: A027145 A027146 A027147 * A027149 A027150 A027151

Keyword

nonn

Author

Clark Kimberling

Status

approved