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A290437
a(n) = A289676(3*n+2).
0
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.
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Aug 02 2017
STATUS
approved