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A086023
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a(n) = Sum_(i=1..n) C(i+3,4)^2.
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23
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1, 26, 251, 1476, 6376, 22252, 66352, 175252, 420277, 931502, 1933503, 3796728, 7109128, 12773528, 22137128
(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+3, 4)^2 = [ C(n+4, 5)/126 ]*[ 126 +420*C(n-1, 1) +540*C(n-1, 2) +315*C(n-1, 3) +70*C(n-1, 4) ]
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CROSSREFS
| Cf. A087127, A024166, A085438, A085439, A085440, A085441, A085442, A086020, A086021, A086022, A086024, A086025, A086026, A086027, A086028, A086029, A086030.
Sequence in context: A088889 A060105 A108645 * A125389 A109467 A126547
Adjacent sequences: A086020 A086021 A086022 * A086024 A086025 A086026
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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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