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A027288 a(n) = Sum_{k=0..floor(n/2)} T(n,k) * T(n,k+1)}, with T given by A026009. 1
1, 4, 12, 46, 145, 552, 1820, 6918, 23562, 89645, 312664, 1191885, 4232345, 16170728, 58229100, 222997812, 811985790, 3116622123, 11451785640, 44047806725, 163072988442, 628465576101, 2341484487832, 9040083756276, 33863310322100, 130957152428622 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..25.

CROSSREFS

Sequence in context: A188312 A006735 A166115 * A149370 A149371 A149372

Adjacent sequences: A027285 A027286 A027287 * A027289 A027290 A027291

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Oct 26 2019

STATUS

approved

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Last modified February 2 03:17 EST 2023. Contains 359997 sequences. (Running on oeis4.)