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A098172
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Triangle T(n,k) with diagonals T(n,n-k)=Binomial(n,3k).
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2
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1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 4, 1, 0, 0, 0, 0, 10, 1, 0, 0, 0, 0, 1, 20, 1, 0, 0, 0, 0, 0, 7, 35, 1, 0, 0, 0, 0, 0, 0, 28, 56, 1, 0, 0, 0, 0, 0, 0, 1, 84, 84, 1, 0, 0, 0, 0, 0, 0, 0, 10, 210, 120, 1, 0, 0, 0, 0, 0, 0, 0, 0, 55, 462, 165, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 220, 924, 220, 1, 0, 0
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,14
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COMMENTS
| Row sums are A024493.
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FORMULA
| Triangle T(n, k)=Binomial(n, 3(n-k))
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EXAMPLE
| Rows begin {1}, {0,1}, {0,0,1}, {0,0,1,1}, {0,0,0,4,1}, {0,0,0,0,10,1},...
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CROSSREFS
| Cf. A098158.
Sequence in context: A124120 A093318 A127560 * A049759 A137252 A036875
Adjacent sequences: A098169 A098170 A098171 * A098173 A098174 A098175
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KEYWORD
| easy,nonn,tabl
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Aug 30 2004
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