login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A078157
A078152(2^n).
3
0, 0, 0, 2, 4, 8, 13, 22, 34, 52, 77, 114, 166, 240, 345, 494, 705, 1004, 1427, 2026, 2873, 4072, 5767, 8166, 11558, 16356, 23141, 32738, 46309, 65504, 92648, 131038, 185328, 262108, 370690, 524250, 741416, 1048536, 1482869, 2097110, 2965777
OFFSET
1,4
FORMULA
For n>1, a(n) = floor(sqrt(2^(n+2))) - n - 2
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Nov 27 2002
EXTENSIONS
Extended by Robert G. Wilson v, Dec 02 2002
More terms from Max Alekseyev, Feb 12 2012
STATUS
approved