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A027172
a(n) = (1/2) * A027170(2n, n).
0
5, 21, 78, 285, 1048, 3892, 14584, 55053, 209064, 797808, 3056870, 11752676, 45316898, 175175818, 678639148, 2634146413, 10241938408, 39882831448, 155519160718, 607181138848, 2373227900938, 9285480209458, 36364319046898
OFFSET
1,1
COMMENTS
A027175(n) + 2.
CROSSREFS
Sequence in context: A268202 A055219 A108863 * A244198 A186244 A255447
KEYWORD
nonn
STATUS
approved