A209156 Triangle read by rows: denominators of Stirling-like triangle of rational numbers.

1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 3, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 3, 4, 2, 2, 1, 1, 1, 3, 3, 1, 3, 1, 1

Offset

1,5

Links

Table of n, a(n) for n=1..36.

Joseph M. Santmyer, A Stirling like sequence of rational numbers, Discrete Math. 171 (1997), no. 1-3, 229-235. MR1454453.

Example

Triangle begins:
-1,
-1,1,
-1,3/2,-1,
-1,1,-2,1,
-1,5,-5/3,5/2,-1,
-1,1,-5,5/2,-3,1,
-1,7,-7/3,35/4,-7/2,7/2,-1,
-1,4,-28/3,7/3,-14,14/3,-4,1,...

Crossrefs

Cf. A209155.

Sequence in context: A359250 A322482 A231071 * A329325 A341149 A191004

Adjacent sequences: A209153 A209154 A209155 * A209157 A209158 A209159

Keyword

nonn,frac,tabl,more

Author

N. J. A. Sloane, Mar 05 2012

Status

approved