references needed

[Dean Hickerson]

Here are the references for A002902 and A002921:

> %I A002902 M2990 N1210
> %S A002902 1,3,15,75,363,1767,8463,40695,193983,926943,4404939,20967075,
> %T A002902 99421371,471987255,2234455839,10587573027,50060937987,
> %U A002902 236865126051
> %N A002902 n-step self-avoiding walks on cubic lattice.
> *** %R A002902 Proceedings of the Physical Society, Vol. 92, p. 649, 1967.

%D A002902 D. S. McKenzie and C. Domb, The second osmotic virial coefficient of athermal polymer solutions, Proceedings of the Physical Society, 92 (1967) 632-649.

> %I A002921 M4866 N2081
> %S A002921 1,12,132,1404,14652,151116,1546332,15734460,159425580,1609987708,
> %T A002921 16215457188,162961837500,1634743178420
> %N A002921 Susceptibility series for f.c.c. lattice.
> *** %R A002921 Solid State Physics (Journal of Physics C), Vol. 3, p. 268, 1970.

%D A002921 C. Domb, Self-avoiding walks and the Ising and Heisenberg models, Solid State Physics (Journal of Physics C), 3 (1970) 256-284.

Dean Hickerson
dean at math.ucdavis.edu