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A135420
a(n) = 4^n * 5^(n^2).
2
1, 20, 10000, 125000000, 39062500000000, 305175781250000000000, 59604644775390625000000000000, 291038304567337036132812500000000000000, 35527136788005009293556213378906250000000000000000
OFFSET
0,2
COMMENTS
Hankel transform of A132864.
For n>0, a(n) is even with a last digit of 0 and is 1 when n=0. - Wesley Ivan Hurt, Dec 04 2013
LINKS
FORMULA
a(n) = 4^n*5^(n^2) = A000302(n) * A060758(n).
MAPLE
A135420:=n->4^n*5^(n^2); seq(A135420(n), n=0..10); # Wesley Ivan Hurt, Dec 04 2013
MATHEMATICA
Table[4^n*5^(n^2), {n, 0, 10}] (* Wesley Ivan Hurt, Dec 04 2013 *)
CROSSREFS
Sequence in context: A250021 A203308 A109122 * A045811 A086687 A173790
KEYWORD
nonn
AUTHOR
Philippe Deléham, Dec 11 2007
STATUS
approved