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A074912
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Triangle generated by Pascal's rule, except begin and end the n-th row with phi(n).
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1
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1, 1, 1, 2, 2, 2, 2, 4, 4, 2, 4, 6, 8, 6, 4, 2, 10, 14, 14, 10, 2, 6, 12, 24, 28, 24, 12, 6, 4, 18, 36, 52, 52, 36, 18, 4, 6, 22, 54, 88, 104, 88, 54, 22, 6, 4, 28, 76, 142, 192, 192, 142, 76, 28, 4
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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EXAMPLE
| 1;
1,1;
2,2,2;
2,4,4,2;
4,6,8,6,4;
2,10,14,14,10,2;
6,12,24,28,24,12,6;
4,18,36,52,52,36,18,4;
6,22,54,88,104,88,54,22,6;
4,28,76,142,192,192,142,76,28,4;
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MAPLE
| A074912 := proc(n, k) if k=1 or k=n then numtheory[phi](n); elif k > n or k < 1 then 0; else procname(n-1, k-1)+procname(n-1, k) ; end if; end proc: # R. J. Mathar, Aug 24 2011
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CROSSREFS
| Sequence in context: A023155 A085311 A052273 * A158502 A195427 A006643
Adjacent sequences: A074909 A074910 A074911 * A074913 A074914 A074915
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KEYWORD
| easy,nonn,tabl
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AUTHOR
| Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Oct 01 2002
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