OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..35
FORMULA
a(n) = (6^n - 1)*(6^n - 6)*...*(6^n - 6^(n-1)) for n>0, a(0)=1.
MATHEMATICA
Table[Product[6^n - 6^k, {k, 0, n-1}], {n, 0, 60}]
PROG
(Magma)
[1] cat [&*[(6^n - 6^k): k in [0..n-1]]: n in [1..8]]; // Bruno Berselli, Jan 28 2013
(Magma) /* By the second formula: */
m:=9;
A109354 := [6^(n*(n-1) div 2): n in [0..m-1]];
A027873 := [1] cat [&*[6^i-1: i in [1..n]]: n in [1..m]];
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Jan 28 2013
STATUS
approved