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A028359
Two-bell analog of A028355.
5
1, 2, 12, 121, 212, 1212, 12121, 21212, 121212, 1212121, 2121212, 12121212, 121212121, 212121212, 1212121212, 12121212121, 21212121212, 121212121212, 1212121212121, 2121212121212, 12121212121212, 121212121212121, 212121212121212, 1212121212121212, 12121212121212121
OFFSET
1,2
COMMENTS
Consider the infinite digits: 121212... . We can break this into a sequence of integers such that the sum of digits in the n-th value is n. - Seiichi Manyama, Oct 31 2018
LINKS
FORMULA
Conjectures from Chai Wah Wu, Apr 18 2024: (Start)
a(n) = 101*a(n-3) - 100*a(n-6) for n > 6.
G.f.: x*(10*x^4 + 20*x^3 + 12*x^2 + 2*x + 1)/(100*x^6 - 101*x^3 + 1). (End)
CROSSREFS
Sequence in context: A062080 A221279 A165300 * A034524 A051782 A048173
KEYWORD
nonn,base
EXTENSIONS
More terms from Seiichi Manyama, Oct 31 2018
STATUS
approved