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A048345 a(n)^2 is the smallest square containing exactly n 0's. 1
0, 10, 320, 100, 3200, 1000, 32000, 10000, 320000, 100000, 3200000, 1000000, 32000000, 10000000, 320000000, 100000000, 3200000000, 1000000000, 32000000000, 1000000000, 320000000000, 100000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..22.

Eric Weisstein's World of Mathematics, Square Number

Index entries for linear recurrences with constant coefficients, signature (0,10).

FORMULA

a(n) = 10a(n-2), a(0)=0, a(1)=10, a(2)=320. G.f.: (10x+320x^2)/(1-10x^2). - Ralf Stephan, Jul 18 2013

CROSSREFS

Cf. A036507.

Sequence in context: A291561 A302933 A180584 * A325726 A223298 A164055

Adjacent sequences:  A048342 A048343 A048344 * A048346 A048347 A048348

KEYWORD

nonn,base,easy

AUTHOR

Patrick De Geest, Mar 15 1999.

EXTENSIONS

More terms from Lior Manor Jul 02 2001

STATUS

approved

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Last modified June 17 16:29 EDT 2019. Contains 324195 sequences. (Running on oeis4.)