|
| |
|
|
A026809
|
|
a(n) = 3^n*(3^n-1)*(3^n-2)/6.
|
|
1
|
|
|
|
0, 1, 84, 2925, 85320, 2362041, 64304604, 1741001445, 47050068240, 1270739210481, 34313445309924, 926494403955165, 25015631334908760, 675424587904113321, 18236486750190760044, 492385348146244352085, 13294406252968671566880
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,3
|
|
|
LINKS
|
|
|
|
FORMULA
|
|
|
|
MAPLE
|
|
|
|
MATHEMATICA
|
|
|
|
PROG
|
(PARI) vector(21, n, binomial(3^(n-1), 3) ) \\ G. C. Greubel, Nov 08 2019
(Magma) [Binomial(3^n, 3): n in [0..20]]; // G. C. Greubel, Nov 08 2019
(Sage) [binomial(3^n, 3) for n in (0..20)] # G. C. Greubel, Nov 08 2019
(GAP) List([0..20], n-> Binomial(3^n, 3) ); # G. C. Greubel, Nov 08 2019
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
