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A089141
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Square array, read by antidiagonal: T(n,k) = n*T(n,k-1)+(-1)^k*T(n,floor(k/2)).
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1
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1, 2, 1, 1, 3, 1, 3, 5, 4, 1, 1, 13, 11, 5, 1, 2, 23, 37, 19, 6, 1, 1, 51, 107, 81, 29, 7, 1, 4, 97, 332, 319, 151, 41, 8, 1, 1, 207, 985, 1295, 749, 253, 55, 9, 1, 2, 401, 2992, 5161, 3774, 1511, 393, 71, 10, 1, 1, 825, 8939, 20725, 19021, 9107, 2743, 577, 89, 11, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| Row 1 :1, 2, 1, 3, 1, 2, 1, 2, 1, 4, 1, 2, 1, ...(A001511).
Row 2 :1, 3, 5, 13, 23, 51, 97, 207, 401, 825, 1627, ...(A089067).
Row 3 :1, 4, 11, 37, 107, 332, 985, 2992, 8939, 26924, 80665, ...
Row 4 :1, 5, 19, 81, 319, 1295, 5161,20725, 82819, 331595, 1326061, ...
Row 5 :1, 6, 29, 151, 749, 3774, 19021, 94954, 475519, 2376846, 11888004, ...
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CROSSREFS
| Cf. A001511, A089067.
Sequence in context: A092865 A098925 A052920 * A170820 A003687 A104575
Adjacent sequences: A089138 A089139 A089140 * A089142 A089143 A089144
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KEYWORD
| easy,nonn,tabl
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AUTHOR
| DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Dec 05 2003
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