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A143901
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Rectangular array R by antidiagonals: R(m,n) = number of white squares
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1
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1, 1, 1, 2, 2, 2, 2, 3, 3, 2, 3, 4, 5, 4, 3, 3, 5, 6, 6, 5, 3, 4, 6, 8, 8, 8, 6, 4, 4, 7, 9, 10, 10, 9, 7, 4, 5, 8, 11, 12, 13, 12, 11, 8, 5, 5, 9, 12, 14, 15, 15, 14, 12, 9, 5, 6, 10, 14, 16, 18, 18, 18, 16, 14, 10, 6, 6, 11, 15, 18, 20, 21, 21, 20, 18, 15, 11, 6, 7, 12, 17, 20, 23, 24, 25, 24
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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COMMENTS
| Antidiagonal sums: (1,2,6,10,19,...)=A005993.
Diagonals: A000982, A000217, A007590, A000096, A116940.
Rows and columns: A004526, A000027, A007494, A005843, A047218 et al.
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FORMULA
| R(m,n)=Floor((mn+1)/2).
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EXAMPLE
| Northwest corner:
1 1 2 2 3 3 4 4
1 2 3 4 5 6 7 8
2 3 5 6 8 9 11 12
2 4 6 8 10 12 14 16
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CROSSREFS
| Cf. A143902.
Sequence in context: A093450 A096198 A103183 * A115263 A055894 A168557
Adjacent sequences: A143898 A143899 A143900 * A143902 A143903 A143904
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KEYWORD
| nonn,tabl
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu), Sep 04 2008
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