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A026021 T(n,[ n/2 ]), where T is the array defined in A026009. 1
1, 1, 2, 3, 6, 10, 19, 34, 62, 117, 207, 407, 704, 1430, 2431, 5070, 8502, 18122, 30056, 65246, 107236, 236436, 385662, 861764, 1396652, 3157325, 5088865, 11622015, 18642420, 42961470, 68624295, 159419670, 253706790, 593636670, 941630580 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..34.

FORMULA

Conjecture: -(n+7)*(5*n-34)*a(n) +8*(-n-14)*a(n-1) +(27*n^2-83*n-428)*a(n-2) +8*(4*n+5)*a(n-3) 44*(n-3)*(7*n-27)*a(n-4)=0. - R. J. Mathar, Jun 20 2013

CROSSREFS

Cf. A026009.

Sequence in context: A165920 A274160 A190501 * A291875 A227309 A123916

Adjacent sequences:  A026018 A026019 A026020 * A026022 A026023 A026024

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified September 28 14:14 EDT 2022. Contains 357070 sequences. (Running on oeis4.)