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A017203
a(n) = (9*n + 3)^7.
1
2187, 35831808, 1801088541, 21870000000, 137231006679, 587068342272, 1954897493193, 5455160701056, 13348388671875, 29509034655744, 60170087060757, 114868566764928, 207616015289871, 358318080000000, 594467302491009, 953133216331392, 1483273860320763, 2248392813428736
OFFSET
0,1
LINKS
FORMULA
From Amiram Eldar, Oct 03 2024: (Start)
a(n) = A017197(n)^7 = 3^7 * A016783(n).
Sum_{n>=0} 1/a(n) = 28*Pi^7/(215233605*sqrt(3)) + 1093*zeta(7))/4782969. (End)
MATHEMATICA
Table[(9*n + 3)^7, {n, 0, 20}] (* Amiram Eldar, Oct 03 2024 *)
PROG
(Magma) [(9*n+3)^7: n in [0..20]]; // Vincenzo Librandi, Jul 23 2011
CROSSREFS
KEYWORD
nonn,easy
STATUS
approved