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Search: id:A109393
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| A109393 |
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Entries in 3-dimensional solid related to Prouhet-Tarry problem. |
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+0
5
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| 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 2, 1, 1, 5, 5, 1, 2, 5, 2, 1, 1, 1, 3, 3, 1, 1, 7, 12, 7, 1, 3, 12, 12, 3, 3, 7, 3, 1, 1, 1, 4, 6, 4, 1, 1, 9, 22, 22, 9, 1, 4, 22, 36, 22, 4, 6, 22, 22, 6, 4, 9, 4, 1, 1, 1, 5, 10, 10, 5, 1, 1, 11, 35, 50, 35, 11, 1, 5, 35, 80, 80, 35, 5, 10, 50, 80, 50
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OFFSET
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0,7
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COMMENT
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Entries of slices [1,k] in A109672, read by rows.
Slice [n,0] gives A046816, slice [0,k] gives A109649, slice [n,n] gives A109673, slice [n,1] gives A109390.
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FORMULA
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Sum of terms in 2D slice [1, k] is 3^(1+k).
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EXAMPLE
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Slice [1,0]:
... 1 ...
.. 1 1 ...
Slice [1,1]:
... 1 1 ...
.. 1 3 1 ...
... 1 1 ...
Slice [1,2]:
... 1 2 1 ...
.. 1 5 5 1 ...
... 2 5 2 ...
.... 1 1 ....
Slice [1,3]:
... 1 3 3 1 ...
.. 1 7 12 7 1 ...
... 3 12 12 3 ...
.... 3 7 3 ....
..... 1 1 .....
Slice [1,4]:
... 1 4 6 4 1 ...
.. 1 9 22 22 9 1 ...
... 4 22 36 22 4 ...
.... 6 22 22 6 ....
..... 4 9 4 .....
...... 1 1 ......
Slice [1,5]:
... 1 5 10 10 5 1 ...
.. 1 11 35 50 35 11 1 ...
... 5 35 80 80 35 5 ...
.... 10 50 80 50 10 ....
..... 10 35 35 10 .....
...... 5 11 5 ......
....... 1 1
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CROSSREFS
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Cf. A109390.
Sequence in context: A023593 A117544 A030393 this_sequence A030348 A109673 A023591
Adjacent sequences: A109390 A109391 A109392 this_sequence A109394 A109395 A109396
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KEYWORD
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nonn,tabf,easy
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Aug 26 2005
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