|
| |
| |
|
|
|
1, 6, 42, 27, 480, 265, 7070, 3815, 1820, 1449, 107338, 56903, 4636632, 2635061, 993850, 633919, 71014372, 42899857, 8111619802, 4675943415, 1414861448, 819657397, 113827776894, 75106291091, 41292848428
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,2
|
|
|
LINKS
|
Table of n, a(n) for n=1..25.
|
|
|
FORMULA
|
a(n) = sum_{m=1..n} A117692(n,m).
|
|
|
MATHEMATICA
|
f[n_] := If[PrimeQ[n] == True, n, 1] cf[0] = 1; cf[n_Integer?Positive] := cf[n] = f[n]*cf[n - 1] bf[n_Integer?Positive, m_Integer?Positive] := bf[n, m] = cf[n]^2/(cf[m]*cf[n - m]) b = Table[Table[bf[n, m], {m, 1, n}], {n, 1, 10}] Flatten[b] c = Table[Apply[Plus, Table[bf[n, m], {m, 1, n}]], {n, 1, 25}]
|
|
|
CROSSREFS
|
Cf. A034386.
Sequence in context: A112960 A181041 A109856 * A153243 A186885 A097253
Adjacent sequences: A117690 A117691 A117692 * A117694 A117695 A117696
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
Roger L. Bagula, Apr 12 2006
|
|
|
EXTENSIONS
|
Description simplified, offset corrected by the Assoc. Eds. of the OEIS, Jun 27 2010
|
|
|
STATUS
|
approved
|
| |
|
|
