1,2

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

Index entries for sequences related to rooted trees

Eric Weisstein's World of Mathematics, Graph Edge

a(n) = n*A000081(n).

Cf. A000081, A000169, A055543, A055544.

Sequence in context: A026134 A105696 A074413 this_sequence A126285 A026163 A005717

Adjacent sequences: A055541 A055542 A055543 this_sequence A055545 A055546 A055547

nonn

Eric Weisstein (eric(AT)weisstein.com)