A293152 a(n) = Euler(n)*Fibonacci(n) - n!.

-1, 0, -1, -2, -9, -40, -232, -1504, -11235, -93056, -850145, -8429312, -89803440, -1015217152, -12019201363, -146382407680, -1783367400885, -20532475363328, -188164624388456, -24471752081408, 72659080250216625, 3108155517786914816, 104237186599257684611, 3246985576741891211264

Offset

0,4

Comments

Note that Morales et al. (2016) appear to assert that Euler(n)*Fibonacci(n) >= n!, but that is using a non-standard indexing for the Fibonacci numbers - see A293151 for their version.

Links

Table of n, a(n) for n=0..23.

Alejandro H. Morales, I. Pak, G. Panova, Why is pi < 2 phi?, Preprint, 2016. [Note that this paper uses a non-standard indexing for the Fibonacci numbers - compare A293151.]

Crossrefs

Cf. A000045, A000111. See A293151 for another version.

Sequence in context: A296964 A261047 A052846 * A327827 A056844 A220471

Adjacent sequences: A293149 A293150 A293151 * A293153 A293154 A293155

Keyword

sign

Author

N. J. A. Sloane, Oct 09 2017

Status

approved