OFFSET
1,1
COMMENTS
The sequence of all n for which a(n)=1 is A191748 = {1,2,5,6,10,14,...}.
MATHEMATICA
Flatten[Table[Array[KroneckerDelta, {n, n}], {n, 1, 6}]] (* Geoffrey Critzer, Dec 11 2011 *)
PROG
(PARI) for(n=1, 9, for(a=1, n, for(b=1, n, print1(a==b", ")))) \\ Charles R Greathouse IV, Jun 29 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
L. Edson Jeffery, Jun 27 2011
STATUS
approved