OFFSET
0,2
LINKS
Masao Koike, Modular forms on non-compact arithmetic triangle groups, Unpublished manuscript [Extensively annotated with OEIS A-numbers by N. J. A. Sloane, Feb 14 2021. I wrote 2005 on the first page but the internal evidence suggests 1997.] See page 29.
MAPLE
A341306 := proc(n)
add( A004016(i)*x^i, i=0..n) ;
coeftayl(%^8, x=0, n) ;
end proc:
seq(A341306(n), n=0..25) ; # R. J. Mathar, Feb 22 2021
MATHEMATICA
A004016[n_] := If[n == 0, 1, 6 Sum[KroneckerSymbol[d, 3], {d, Divisors[n]}]];
a[n_] := SeriesCoefficient[Sum[A004016[i]*x^i, {i, 0, n}]^8, {x, 0, n}];
Table[a[n], {n, 0, 25}] (* Jean-François Alcover, Apr 16 2023, after R. J. Mathar *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 14 2021
EXTENSIONS
Terms a(5) and beyond from R. J. Mathar, Feb 22 2021
STATUS
approved