A122684 Sum of all Wiener indices of "chemical" trees described by A000602(n).

0, 1, 4, 19, 54, 155, 432, 1252, 3384, 9714, 26752, 75836, 213058, 603791, 1702868, 4830747, 13666890, 38742120, 109715858, 310884129, 880368618, 2493252951, 7058102770, 19978082407, 56531061316, 159932660960, 452354328946, 1279190479845, 3616595649500

Offset: 1

Author

N. J. A. Sloane, Sep 23 2006

Keywords

• nonn

Comments

C program, see the first Bomfim link, around the function Gen() of Gang Li & Frank Ruskey.

References

• S. Wagner, Graph-theoretical enumeration and digital expansions: an analytic approach, Dissertation, Fakult. f. Tech. Math. u. Tech. Physik, Tech. Univ. Graz, Austria, Feb., 2006.

Links

• W. Bomfim, C program
• Stephan Wagner, On the average Wiener index of degree-restricted trees

Extensions

a(11)-a(29) from Washington Bomfim, Feb 24 2011