A290440 a(n) = A289677(3*n+2).

1, 2, 4, 12, 19, 46, 88, 185, 380, 793, 1589, 3106, 6078, 12147, 24534, 49482, 99792, 201892, 408478

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: A309664 A024872 A129021 * A090922 A056228 A166869

Adjacent sequences: A290437 A290438 A290439 * A290441 A290442 A290443

Keyword

nonn,more

Author

N. J. A. Sloane, Aug 02 2017

Status

approved