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A290439 a(n) = A289677(3*n+1). 0
0, 2, 4, 11, 22, 43, 85, 171, 366, 774, 1586, 3136, 6123, 12088, 24283, 49040, 99031, 200444, 405931 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

No formulas or recurrences are known for the important sequences A289670 and A289671. The essence of these two sequences is captured in the six entries A290436-A290441. Any numerical properties of these would be most welcome.

LINKS

Table of n, a(n) for n=0..18.

CROSSREFS

Cf. A284116, A284119, A284121, A289670-A289677, A290436-A290441.

Sequence in context: A295947 A018774 A102608 * A018259 A018480 A004646

Adjacent sequences:  A290436 A290437 A290438 * A290440 A290441 A290442

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Aug 02 2017

STATUS

approved

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Last modified September 19 11:33 EDT 2021. Contains 347556 sequences. (Running on oeis4.)