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#31 by Joerg Arndt at Tue Sep 22 03:54:25 EDT 2020
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#30 by Seiichi Manyama at Tue Sep 22 03:47:44 EDT 2020
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#29 by Seiichi Manyama at Tue Sep 22 02:53:16 EDT 2020
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#28 by Seiichi Manyama at Tue Sep 22 02:52:18 EDT 2020
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| LINKS
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Seiichi Manyama, <a href="/A337785/b337785.txt">Table of n, a(n) for n = 1..500</a>
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| STATUS
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approved
editing
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#27 by N. J. A. Sloane at Tue Sep 22 01:45:43 EDT 2020
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#26 by Seiichi Manyama at Mon Sep 21 18:26:41 EDT 2020
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#25 by Seiichi Manyama at Mon Sep 21 18:18:30 EDT 2020
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| PROG
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def f(n, ary)
s = 0
ary = [1]
(n. - 1).times{|i|
s += ary.inject(:+)
ary = [0] + ary + [0]
ary = (10..n - 1 - i + 1).map{|j| ary[j - 1] + ary[j]} + 1] + 1}
sary
s_ary = f(s + 1)
sum = f( = (0..s + 1).inject(0){|t, m| t + s_ary[m] * a)[m]}
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| STATUS
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proposed
editing
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#24 by Seiichi Manyama at Mon Sep 21 16:10:50 EDT 2020
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#23 by Seiichi Manyama at Mon Sep 21 16:09:38 EDT 2020
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| PROG
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f_ary = (1..n - 1 / 2).map{|i| [i]}
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| STATUS
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proposed
editing
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#22 by Seiichi Manyama at Mon Sep 21 15:49:06 EDT 2020
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