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A027083 a(n) = A027082(n, n+2) 1
2, 6, 14, 28, 54, 102, 190, 352, 650, 1198, 2206, 4060, 7470, 13742, 25278, 46496, 85522, 157302, 289326, 532156, 978790, 1800278, 3311230, 6090304, 11201818, 20603358, 37895486, 69700668, 128199518, 235795678, 433695870 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..32.

FORMULA

G.f.: (2x^2(1+x+x^2))/((1-x)(1-x-x^2-x^3)). Cf. A008937.

a(n) = A027024(n) + 1.

CROSSREFS

Cf. A008937, A027024, A027082.

Sequence in context: A033547 A050531 A290699 * A249665 A321027 A214907

Adjacent sequences:  A027080 A027081 A027082 * A027084 A027085 A027086

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified November 11 22:31 EST 2019. Contains 329046 sequences. (Running on oeis4.)