a(0)=10
a(0 0)=10…0共a(0)个0
a(0 0 0)=10…0共a(0 0)个0
……
a(00)=a(0 0 … 0)共a(0)个0
a(00 0)=10…0共a(00)个0
a(00 0 0)=10…0共a(00 0)个0
a(00 0 0 0)=10…0共a(00 0 0)个0
……
a(000)=a(00 00 … 00)共a(00)个00
a(0000)=a(000 000 … 000)共a(000)个000
a(00000)=a(0000 0000 … 0000)共a(0000)个0000
a(0(0))=a(000…0)共a(0)个0
以此类推:
a(0(0 0))=a(0(0) 0(0) … 0(0))共a(0(0))个a(0)
a(0(0 0 0))=a(0(0 0) 0(0 0) … 0(0 0))共a(0(0 0))个a(0 0)
a(0(00))=a(0(0 0 … 0))共a(0(0))个0
a(0(00 0))=a(0(00) 0(00) … 0(00))
a(0(00 0 0))=a(0(00 0) 0(00 0) … 0(00 0))
……
a(0(000))=a(0(00 00 … 00)
a(0(0000))=a(0(000 000 … 000)
a(0(0(0)))=a(0(0000…0)
a(0(0(0(0))))=a(0(0(000…0))
……
a(1)=a(0(0(0(…0(0)…))))
a(1)之后的规则类似上述,有
a(1 0 0 0), a(1 000), a(1 0(0(0)))
a(1 1), a(11), a(1111 0000), a(1(0(0)))
a(1(1(1)))
之后a(2)=a(1(1(…1(1)…)))
a(3)=a(2(2(…2(2)…)))
……
a(n)