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A233446 a(n) = ((2n-1)^(2n+1) + (2n+1)^(2n-1))/(2n)^2 = A154682(n)/(2n)^2 for n > 0. 2
1, 23, 2637, 705259, 337390073, 252186614847, 271082082053317, 396049017137512403, 754792662169555947633, 1818644980834260579498343, 5405067064522549127719680701, 19423396040054801221090342470843, 83016890560608261435356904433668457, 416213066932582983199004231480676255119, 2419095491735191624607023665166934072373813 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
a(n) = ((2n-1)^(2n+1) + (2n+1)^(2n-1))/(2n)^2; n > 0.
MATHEMATICA
Table[((2 n - 1)^(2 n + 1) + (2 n + 1)^(2 n - 1))/(2 n)^2, {n, 1, 15}]
CROSSREFS
Cf. A154682.
Sequence in context: A336170 A232362 A233226 * A088385 A030461 A152521
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, Dec 10 2013
STATUS
approved

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Last modified March 28 14:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)