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Related to triangle A056858 of number of rises in set partitions of n at a given index i.
6

%I #15 Aug 19 2017 16:24:52

%S 1,-1,1,-2,1,1,-3,4,2,1,-4,9,10,4,1,-5,16,28,24,8,1,-6,25,60,80,56,16

%N Related to triangle A056858 of number of rises in set partitions of n at a given index i.

%D W. C. Yang, Conjectures on some sequences involving set partitions and Bell numbers, preprint, 2000. [Apparently unpublished. - _R. J. Mathar_, Oct 06 2011]

%e 1,-1;

%e 1,-2,1;

%e 1,-3,4,2;

%e 1,-4,9,10,4;

%e ...

%Y Cf. Bell numbers A000110.

%Y Cf. A056857-A056862.

%K sign,tabf,more,obsc,uned

%O 1,4

%A Winston C. Yang (winston(AT)cs.wisc.edu), Aug 31 2000