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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 Adjacent sequences: A233443 A233444 A233445 * A233447 A233448 A233449 KEYWORD nonn AUTHOR Alexander Adamchuk, Dec 10 2013 STATUS approved

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Last modified March 21 16:33 EDT 2023. Contains 361408 sequences. (Running on oeis4.)