|
Search: id:A086021
|
|
|
| A086021 |
|
a(n) = Sum_(i=1..n) C(i+2,3)^3. |
|
+0
23
|
|
| 1, 65, 1065, 9065, 51940, 227556, 820260, 2548260, 7040385, 17688385, 41082041, 89310585, 183506960, 359122960, 673554960
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
LINKS
|
A. F. Labossiere New Artefact From Pascal's Triangle.
A. F. Labossiere Miscellaneous.
|
|
FORMULA
|
Sum_(i=1..n) C(i+2, 3)^3 = [ C(n+3, 4)/1 ]*[ 1 +12*C(n-1, 1) +46*C(n-1, 2) +84*C(n-1, 3) +81*C(n-1, 4) +40*C(n-1, 5) +8*C(n-1, 6) ]
|
|
CROSSREFS
|
Cf. A086020, A086022, A086023, A086024, A086025, A086026, A086027, A086028, A086029, A086030, A087127, A024166, A085438, A085439, A085440, A085441, A085442.
Sequence in context: A000540 A023875 A027463 this_sequence A069424 A086029 A002502
Adjacent sequences: A086018 A086019 A086020 this_sequence A086022 A086023 A086024
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Andre F. Labossiere (boronali(AT)laposte.net), Jul 11 2003
|
|
|
Search completed in 0.002 seconds
|
