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A091339 a(n) = a(n-1)*a(n-2) + (n-2); a(1) = 1, a(2) = 2. 1
1, 2, 3, 8, 27, 220, 5945, 1307906, 7775501177, 10169624642405370, 79073928376671158546120499, 804152170591192270227367107671577224679640, 63587471141272584754077292003976884470033921630214659882200111940371 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
a(19) is a composite number with 1217 digits, and it has no prime factors < 10^9. - Jianing Song, Nov 25 2023
LINKS
MATHEMATICA
a[1] = 1; a[2] = 2; a[n_] := a[n - 1]a[n - 2] + n - 2; Table[ a[n], {n, 13}] (* Robert G. Wilson v, Dec 10 2004 *)
CROSSREFS
Sequence in context: A318895 A093858 A080568 * A006277 A186927 A177010
KEYWORD
nonn,easy
AUTHOR
Martti V. A. Holopainen (martti.holopainen(AT)pp2.inet.fi), Dec 06 2004
EXTENSIONS
More terms from Robert G. Wilson v, Dec 10 2004
STATUS
approved

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Last modified March 18 22:56 EDT 2024. Contains 370952 sequences. (Running on oeis4.)