A376767 a(1) = 1; thereafter, a(n) = c*a(n-1)^2 + a(n-1), where c=4 if n is even, c=2 if n is odd.
1, 5, 55, 12155, 295500205, 349281484915668305, 243995111409788451714836854478814355, 238134457567500314773144369878965950377595240310563734057802960695078455
Offset: 1
Keywords
Examples
a(3) = 2*a(2)^2 + a(2) = 55.
Links
- Paolo Xausa, Table of n, a(n) for n = 1..11
Crossrefs
Cf. A376768.
Programs
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Mathematica
Module[{n = 1}, NestList[If[OddQ[++n], 2, 4]*#^2 + # &, 1, 8]] (* Paolo Xausa, Dec 16 2024 *)
Comments