a(0)=0, a(1)=1, for n>1, a(n) = n<*>n, where k<*>m = k<+>k<+>...<+>k is the m-1-fold iteration of the operation <+> defined in A206853.

A206960

a(0)=0, a(1)=1, for n>1, a(n) = n<*>n, where k<*>m = k<+>k<+>...<+>k is the m-1-fold iteration of the operation <+> defined in A206853.

Terms

    a(0) =0a(1) =1a(2) =4a(3) =9a(4) =31a(5) =66a(6) =190a(7) =385a(8) =1022a(9) =2055a(10) =5112a(11) =10242a(12) =24572a(13) =49153a(14) =114686a(15) =229377a(16) =524287a(17) =1048590a(18) =2359281a(19) =4718599a(20) =10485753a(21) =20971521a(22) =46137342a(23) =92274689a(24) =201326590a(25) =402653191a(26) =872415224a(27) =1744830466a(28) =3758096380a(29) =7516192769

External references