A317955 Apply the morphism 1 -> 12, 2 -> 13, 3 -> 14, 4 -> 1 n times to 1, and concatenate the resulting string.

1, 12, 1213, 12131214, 121312141213121, 12131214121312112131214121312, 12131214121312112131214121312121312141213121121312141213

Offset: 1

Author

N. J. A. Sloane and Doron Zeilberger, Aug 21 2018

Keywords

• nonn

Comments

a(n) is the concatenation a(n) = a(n-1).a(n-2).a(n-3).a(n-4) for n >= 5.

Links

• Seiichi Manyama, Table of n, a(n) for n = 1..11

Crossrefs

Cf. A317953, A317954.