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A236369
4^n! - 3^n! + 2^n! - 1.
0
2, 2, 10, 3430, 281192563951390, 1766847064778382532572997586311708103976882383055495099549785723721857950
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OFFSET
0,1
COMMENTS
The next term has 434 digits. -
Harvey P. Dale
, Nov 04 2017
LINKS
Table of n, a(n) for n=0..5.
FORMULA
a(n)=4^n!-3^n!+2^n!-1.
EXAMPLE
For n=2, a(2)=4^2!-3^2!+2^2!-1=16-9+4-1=10.
MATHEMATICA
4^#-3^#+2^#-1&/@(Range[0, 5]!) (*
Harvey P. Dale
, Nov 04 2017 *)
PROG
(PARI) a(n)=(k->4^k-3^k+2^k-1)(n!) \\
Charles R Greathouse IV
, Jan 23 2014
CROSSREFS
Cf.
A203925
,
A236368
.
Sequence in context:
A069240
A000371
A081088
*
A001038
A283454
A027623
Adjacent sequences:
A236366
A236367
A236368
*
A236370
A236371
A236372
KEYWORD
nonn
AUTHOR
Assoul Abdelkarim
, Jan 23 2014
EXTENSIONS
a(4)-a(5) from
Charles R Greathouse IV
, Jan 23 2014
STATUS
approved
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Last modified May 4 07:22 EDT 2024. Contains 372230 sequences. (Running on oeis4.)