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A027171 a(n) = A027170(2n, n). 0
1, 10, 42, 156, 570, 2096, 7784, 29168, 110106, 418128, 1595616, 6113740, 23505352, 90633796, 350351636, 1357278296, 5268292826, 20483876816, 79765662896, 311038321436, 1214362277696, 4746455801876, 18570960418916 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..22.

CROSSREFS

Sequence in context: A163815 A108678 A226988 * A003822 A087120 A222358

Adjacent sequences:  A027168 A027169 A027170 * A027172 A027173 A027174

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified August 15 11:04 EDT 2022. Contains 356145 sequences. (Running on oeis4.)