OFFSET
1,2
PROG
(PARI) a(n) = {my(d, v=[1]); for(i=2, n, v=concat(v, d=digits(2*i-1))); w=Vecrev(v); fromdigits(vector(2*#v, i, if(i%2, v[1+i\2], w[i/2])))/11; } \\ Jinyuan Wang, May 17 2020
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Amarnath Murthy, Nov 25 2002
EXTENSIONS
More terms from Sean A. Irvine, Aug 15 2011
Corrected by Sean A. Irvine, May 30 2013
STATUS
approved