A262806 a(n) = A065447(n) / A002275(floor((n+1)/2)).

1, 100, 9101, 91010000, 901900901001, 901900901001000000, 901089109010900090010001, 90108910901090009001000100000000, 9010080101801008010090100900009000100001, 90100801018010080100901009000090001000010000000000, 900999901099900099901099900999901000901000900000900001000001

Offset

1,2

Links

Table of n, a(n) for n=1..11.

Formula

a(n) = A065447(n) / A002275(floor((n+1)/2)).

a(2*n) = a(2*n-1) * 10^(2*n).

Example

a(5) = 100111000011111 / 111 = 901900901001.

Crossrefs

Sequence in context: A065689 A260859 A117687 * A108741 A192937 A029798

Adjacent sequences: A262803 A262804 A262805 * A262807 A262808 A262809

Keyword

nonn,base,easy

Author

Max Alekseyev, Oct 03 2015

Status

approved