A317197 a(n) is the concatenation of A103269(n-i) for i = 0,1,2,...,n-1.

1, 121, 1213121, 12131211213121, 121312112131212131211213121, 121312112131212131211213121312112131212131211213121, 12131211213121213121121312131211213121213121121312112131212131211213121312112131212131211213121

Offset: 1

Author

N. J. A. Sloane, Aug 05 2018

Keywords

• nonn

Comments

a(n) is a palindrome.

A027084 gives lengths of these words.

Examples

			a(3) = 1213.12.1 = 1213121.
		

Links

• Bo Tan and Zhi-Ying Wen, Some properties of the Tribonacci sequence, European Journal of Combinatorics, 28 (2007) 1703-1719. See D_n.

Crossrefs

A027084.