|
Search: id:A003470
|
|
|
| A003470 |
|
a(n) = n*a(n-1) - a(n-2) + 1 + (-1)^n.
(Formerly M2759)
|
|
+0
3
|
|
| 1, 1, 3, 8, 31, 147, 853, 5824, 45741, 405845, 4012711, 43733976, 520795003, 6726601063, 93651619881, 1398047697152, 22275111534553, 377278848390249, 6768744159489931, 128228860181918440, 2557808459478878871
(list; graph; listen)
|
|
|
OFFSET
|
0,3
|
|
|
COMMENT
|
Row sums of A086764. - DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Apr 27 2004
|
|
REFERENCES
|
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
|
|
FORMULA
|
Diagonal sums of reverse of permutation triangle A008279. a(n)=sum{k=0..floor(n/2), (n-k)!/k!}. - Paul Barry (pbarry(AT)wit.ie), May 12 2004
|
|
CROSSREFS
|
Cf. A072374.
Sequence in context: A148901 A148902 A108492 this_sequence A148903 A148904 A148905
Adjacent sequences: A003467 A003468 A003469 this_sequence A003471 A003472 A003473
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com), jr
|
|
EXTENSIONS
|
More terms from Gabriel Cunningham (gcasey(AT)mit.edu), Oct 25 2004
|
|
|
Search completed in 0.002 seconds
|
