A290437 a(n) = A289676(3*n+2).

1, 2, 4, 4, 13, 18, 40, 71, 132, 231, 459, 990, 2114, 4237, 8234, 16054, 31280, 60252, 115810

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: A129017 A086915 A059927 * A154987 A089419 A341235

Adjacent sequences: A290434 A290435 A290436 * A290438 A290439 A290440

Keyword

nonn,more

Author

N. J. A. Sloane, Aug 02 2017

Status

approved