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A027121 a(n) = A027113(n, 2n-3). 0
1, 4, 13, 40, 120, 352, 1022, 2948, 8473, 24304, 69649, 199544, 571795, 1639244, 4702499, 13500396, 38790727, 111555296, 321100627, 925086012, 2667533646, 7698716068, 22238169212, 64289860528, 186010834243, 538611262492 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..27.

CROSSREFS

Sequence in context: A307577 A137744 A027130 * A238846 A025567 A003462

Adjacent sequences:  A027118 A027119 A027120 * A027122 A027123 A027124

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified August 10 14:50 EDT 2020. Contains 336381 sequences. (Running on oeis4.)