login
A016831
a(n) = (4n+2)^7.
1
128, 279936, 10000000, 105413504, 612220032, 2494357888, 8031810176, 21870000000, 52523350144, 114415582592, 230539333248, 435817657216, 781250000000, 1338925209984, 2207984167552, 3521614606208, 5455160701056, 8235430000000, 12151280273024, 17565568854912, 24928547056768
OFFSET
0,1
FORMULA
From Amiram Eldar, Apr 21 2023: (Start)
a(n) = A016825(n)^7.
a(n) = 2^7*A016759(n).
Sum_{n>=0} 1/a(n) = 127*zeta(7)/16384.
Sum_{n>=0} (-1)^n/a(n) = 61*Pi^7/23592960. (End)
MATHEMATICA
Table[(4*n + 2)^7, {n, 0, 20}] (* Amiram Eldar, Apr 21 2023 *)
CROSSREFS
KEYWORD
nonn,easy
STATUS
approved