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A051693
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Square array read by antidiagonals: a(n,k)= sum of two positive regular n-polytopic numbers (i.e. a(n,k) = binomial(x,n)+ binomial(y,n) for some x,y>=n).
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0
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2, 2, 3, 2, 4, 4, 2, 5, 6, 5, 2, 6, 8, 7, 6, 2, 7, 10, 11, 9, 7, 2, 8, 12, 16, 14, 11, 8, 2, 9, 14, 22, 20, 20, 12, 9, 2, 10, 16, 29, 27, 30, 21, 13, 10, 2, 11, 18, 37, 35, 42, 36, 24, 16, 11, 2, 12, 20, 46, 44, 56, 57, 40, 30, 18, 12, 2, 13, 22, 56, 54, 72, 85, 62, 50, 36, 20, 13, 2
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| a(2,.)= 2,4,6,7,9,11,12,13,16..= sum of two positive triangular numbers=A051533; a(3,.)= 2,5,8,11,14,20,21,24,30,36,.. = sum of two positive tetrahedral numbers;
2; 2,3; 2,4,4; 2,5,6,5; ...
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CROSSREFS
| A051533.
Sequence in context: A178804 A061889 A175012 * A115980 A088936 A049822
Adjacent sequences: A051690 A051691 A051692 * A051694 A051695 A051696
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KEYWORD
| nice,nonn,tabl
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AUTHOR
| Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de)
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