|
Search: id:A121017
|
|
| |
|
| 1, 1, 6, 65, 1125, 28132, 950649, 41475961, 2259756900, 149874308367, 11858161118925, 1101069785060610, 118366544943589215, 14564702419742606497, 2031425158227034739646, 318472106732688712103885
(list; graph; listen)
|
|
|
OFFSET
|
0,3
|
|
|
FORMULA
|
a(n) = 1/(2e) * Sum{r, s>=0, (rs)^n / [2^r s! ] }.
a(n) = A000670(n)*A000110(n). - Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 27 2006
|
|
MAPLE
|
a:=n->sum(stirling2(n, k)*k!*bell(n), k=0..n): seq(a(n), n=0..19); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Sep 30 2006
|
|
CROSSREFS
|
Sequence in context: A087488 A099343 A006959 this_sequence A137121 A110222 A119230
Adjacent sequences: A121014 A121015 A121016 this_sequence A121018 A121019 A121020
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 08 2006
|
|
EXTENSIONS
|
More terms from Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Sep 30 2006
|
|
|
Search completed in 0.002 seconds
|
