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A027311 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+3), with T given by A026323. 0
4, 43, 396, 3465, 29730, 253008, 2145968, 18184052, 154119660, 1307389666, 11104039000, 94441581936, 804428517984, 6862216318250, 58625961078432, 501592568400544, 4297633705136632, 36872583343109643, 316774930400206020 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..20.

CROSSREFS

Sequence in context: A186678 A186768 A130545 * A198205 A277639 A326432

Adjacent sequences: A027308 A027309 A027310 * A027312 A027313 A027314

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Mar 23 2003

Title corrected by Sean A. Irvine, Oct 27 2019

STATUS

approved

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Last modified February 3 02:45 EST 2023. Contains 360024 sequences. (Running on oeis4.)