|
|
A324915
|
|
a(n) = Sum_{k=1..n} 2^k * sigma(k), where sigma(k) = A000203(k).
|
|
2
|
|
|
2, 14, 46, 158, 350, 1118, 2142, 5982, 12638, 31070, 55646, 170334, 285022, 678238, 1464670, 3496286, 5855582, 16079198, 26564958, 70605150, 137714014, 288708958, 490035550, 1496668510, 2536855902, 5355428190, 10724137310, 25756522846, 41862650206, 119172061534
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
MATHEMATICA
|
Accumulate[Table[2^k*DivisorSigma[1, k], {k, 1, 30}]]
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|