A168121 Triangle T(n,k) read by rows in which column k lists each number A000009 followed by k-1 zeros, for k>0.

1, 1, 1, 2, 0, 1, 2, 1, 0, 1, 3, 0, 0, 0, 1, 4, 2, 1, 0, 0, 1, 5, 0, 0, 0, 0, 0, 1, 6, 2, 0, 1, 0, 0, 0, 1, 8, 0, 2, 0, 0, 0, 0, 0, 1, 10, 3, 0, 0, 1, 0, 0, 0, 0, 1, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 15, 4, 2, 2, 0, 1, 0, 0, 0, 0, 0, 1

Offset

1,4

Links

Table of n, a(n) for n=1..78.

Example

Triangle begins:
==================================================
... Column k: 1. 2. 3. 4. 5. 6. 7. 8. 9 10 11 12
. Row ...........................................
...n ............................................
==================================================
.. 1 ........ 1,
.. 2 ........ 1, 1,
.. 3 ........ 2, 0, 1,
.. 4 ........ 2, 1, 0, 1,
.. 5 ........ 3, 0, 0, 0, 1,
.. 6 ........ 4, 2, 1, 0, 0, 1,
.. 7 ........ 5, 0, 0, 0, 0, 0, 1,
.. 8 ........ 6, 2, 0, 1, 0, 0, 0, 1,
.. 9 ........ 8, 0, 2, 0, 0, 0, 0, 0, 1,
. 10 ....... 10, 3, 0, 0, 1, 0, 0, 0, 0, 1,
. 11 ....... 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
. 12 ....... 15, 4, 2, 2, 0, 1, 0, 0, 0, 0, 0, 1,
...

Crossrefs

Cf. A000009, A168021, A168120.

Sequence in context: A268833 A293386 A322522 * A158948 A140224 A075993

Adjacent sequences: A168118 A168119 A168120 * A168122 A168123 A168124

Keyword

nonn,tabl,easy

Author

Omar E. Pol, Dec 02 2009

Extensions

Edited by Charles R Greathouse IV, Mar 23 2010

Status

approved