A131709
N. J. A. Sloane
njas at research.att.com
Mon Oct 29 05:50:35 CET 2007
A000522 Total number of arrangements of a set with n elements:
a(n) = Sum_{k=0..n} n!/k!.
1, 2, 5, 16, 65, 326, 1957, 13700, 109601, 986410, 9864101,
108505112, 1302061345, 16926797486, 236975164805, 3554627472076,
56874039553217, 966858672404690, 17403456103284421,
330665665962404000, 6613313319248080001
AUTHOR njas
A131178 Floor( e n! ).
2, 2, 5, 16, 65, 326, 1957, 13700, 109601, 986410, 9864101,
108505112, 1302061345, 16926797486, 236975164805, 3554627472076,
56874039553217, 966858672404690, 17403456103284421,
330665665962404000, 6613313319248080001, 138879579704209680022
AUTHOR njas
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