OFFSET
1,2
COMMENTS
Apart from the left border and the right border, the rest of the elements are 3's.
FORMULA
a(n) = A278481(n)/2.
EXAMPLE
The sequence written as a triangle begins:
1;
2, 2;
2, 3, 2;
2, 3, 3, 2;
2, 3, 3, 3, 2;
2, 3, 3, 3, 3, 2;
2, 3, 3, 3, 3, 3, 2;
2, 3, 3, 3, 3, 3, 3, 2;
2, 3, 3, 3, 3, 3, 3, 3, 2;
2, 3, 3, 3, 3, 3, 3, 3, 3, 2;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Omar E. Pol, Nov 23 2016
STATUS
approved