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Theorem 5.4.9L in D. E. Knuth, `The Art of Computer Programming', Volume 3.
Table of n, a(n) for n=1..55.
Index entries for sequences related to trees
a(n)=3*q*n+2*(n-3^q), if 2*3^(q-1)<=n<=3^q; 3*q*n+4*(n-3^q), if 3^q<=n<=2*3^q.
Sequence in context: A162207 A092614 A085899 * A009850 A009853 A008030
Adjacent sequences: A027871 A027872 A027873 * A027875 A027876 A027877
D. E. Knuth
More terms from James A. Sellers