OFFSET
1,2
COMMENTS
EXAMPLE
First run is given by 12 so a(2)=2 and the second run is 2 times a(1)=1 and we get 1211. Next a(3)=1 hence the third run is 1 time [a(1),a(2)]=12 and we get 121112. a(4)=1 hence 4th run is 1 time 121 and we get 121112121 etc.
PROG
(PARI) /* compute 6555 terms: */
v=[1, 2]; for(n=2, 100, v=if(v[n]-2, concat(v, vector(n-1, i, v[i])), concat(concat(v, vector(n-1, i, v[i])), vector(n-1, i, v[i])))); a(n)=v[n]
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Jan 10 2013
STATUS
approved