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A086021
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a(n) = Sum_(i=1..n) C(i+2,3)^3.
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22
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1, 65, 1065, 9065, 51940, 227556, 820260, 2548260, 7040385, 17688385, 41082041, 89310585, 183506960, 359122960, 673554960
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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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) ]
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CROSSREFS
| Cf. A086020, A086022, A086023, A086024, A086025, A086026, A086027, A086028, A086029, A086030, A087127, A024166, A085438, A085439, A085440, A085441, A085442.
Sequence in context: A023875 A027463 A144500 * A168029 A069424 A086029
Adjacent sequences: A086018 A086019 A086020 * A086022 A086023 A086024
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KEYWORD
| easy,nonn
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AUTHOR
| Andre F. Labossiere (boronali(AT)laposte.net), Jul 11 2003
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