OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..30
FORMULA
a(n) = d^n * Product_{k=0..n-1} d^n - d^k.
MATHEMATICA
FoldList[ #1*12^#2 (12^#2-1)&, 1, Range[ 20 ] ]
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved