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%I #24 Feb 20 2023 18:50:43
%S 1,2,3,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
%T 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
%U 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5
%N a(n)=n for n=1,2,3 and 4; a(n)=5 for n>=5.
%C In atomic spectroscopy, a(n) is the number of D term symbols with spin multiplicity equal to n, i.e., there is one singlet-D term (n=1), and there are two doublet-D terms (n=2), three triple-D terms (n=3), four quartet-D terms (n=4) and five terms for every other D term of multiplicity 5 or higher (n>=5).
%C Decimal expansion of 11111/9000. - _Arkadiusz Wesolowski_, Mar 29 2012
%H <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).
%F a(n) = min(n,5). - _Wesley Ivan Hurt_, Apr 16 2014
%t Join[Range@4, Table[5, {83}]] (* _Arkadiusz Wesolowski_, Mar 29 2012 *)
%t PadRight[{1,2,3,4},120,{5}] (* _Harvey P. Dale_, Sep 23 2017 *)
%Y Cf. A010716.
%K easy,nonn
%O 1,2
%A _A. Timothy Royappa_, Mar 16 2012
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