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A127715
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Rightmost border of triangle A127714: a(n) = A127714(n, (n+1)*(n+2)/2 - 1).
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10
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1, 1, 3, 14, 86, 645, 5662, 56632, 633545, 7820115, 105401961, 1538517351, 24157841308, 405778641302, 7256711524298, 137607733327779, 2757147167433326, 58188668578629283, 1289965088962987961
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) = upper left term of M^n, M is an infinite square production matrix in which nonzero terms = A033184 with the first "1" deleted, as follows: M =
1, 1, 0, 0, 0, 0, ...
2, 2, 1, 0, 0, 0, ...
5, 5, 3, 1, 0, 0, ...
14, 14, 9, 4, 1, 0, ...
42, 42, 28, 14, 5, 1, ...
... (End)
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EXAMPLE
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a(3) = 14 = the upper left term of M^3.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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