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A317197
a(n) is the concatenation of A103269(n-i) for i = 0,1,2,...,n-1.
2
1, 121, 1213121, 12131211213121, 121312112131212131211213121, 121312112131212131211213121312112131212131211213121, 12131211213121213121121312131211213121213121121312112131212131211213121312112131212131211213121
OFFSET
1,2
COMMENTS
a(n) is a palindrome.
A027084 gives lengths of these words.
LINKS
Bo Tan and Zhi-Ying Wen, Some properties of the Tribonacci sequence, European Journal of Combinatorics, 28 (2007) 1703-1719. See D_n.
EXAMPLE
a(3) = 1213.12.1 = 1213121.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Aug 05 2018
STATUS
approved