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A349369 Sum of A006369 and its Dirichlet inverse, where A006369 is the inverse of "amusical permutation", A006368. 4
2, 0, 0, 9, 0, 12, 0, 3, 4, 42, 0, -10, 0, 54, 28, 37, 0, 16, 0, -41, 36, 90, 0, 60, 49, 102, 16, -39, 0, -84, 0, 11, 60, 138, 126, 30, 0, 150, 68, 221, 0, -92, 0, -81, 40, 186, 0, -72, 81, -61, 92, -79, 0, 36, 210, 259, 100, 234, 0, 394, 0, 246, 56, 149, 238, -172, 0, -121, 124, -352, 0, 8, 0, 294, -22, -119, 270 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
a(n) = A006369(n) + A349368(n).
a(1) = 2, and for n >1, a(n) = -Sum_{d|n, 1<d<n} A006369(d) * A349368(n/d).
PROG
(PARI)
A006369(n) = if(!(n%3), (2/3)*n, (1/3)*if(1==(n%3), ((4*n)-1), ((4*n)+1)));
memoA349368 = Map();
A349368(n) = if(1==n, 1, my(v); if(mapisdefined(memoA349368, n, &v), v, v = -sumdiv(n, d, if(d<n, A006369(n/d)*A349368(d), 0)); mapput(memoA349368, n, v); (v)));
A349369(n) = (A006369(n)+A349368(n));
CROSSREFS
Cf. also A349352, A349378.
Sequence in context: A113036 A000425 A230878 * A349352 A323896 A345065
KEYWORD
sign
AUTHOR
Antti Karttunen, Nov 17 2021
STATUS
approved

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)