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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A027175(n) + 2.

LINKS

Table of n, a(n) for n=1..23.

CROSSREFS

Sequence in context: A268202 A055219 A108863 * A244198 A186244 A255447

Adjacent sequences:  A027169 A027170 A027171 * A027173 A027174 A027175

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified August 8 10:58 EDT 2022. Contains 356009 sequences. (Running on oeis4.)