来自在线整数百科全书的问候语!http://oeis.org/ Search: id:a007181 Showing 1-1 of 1 %I A007181 M0340 %S A007181 2,2,4,12,30,60,154,404,1046,2540,6720,17484,46522,120300,323800, %T A007181 856032,2315578,6151080,16745530,44921984,122790698,331148108, %U A007181 908909558,2465359580,6788313198,18491757632,51067082988 %N A007181 Expansion of critical exponent for walks on tetrahedral lattice. %C A007181 Using coordinates (x,y,z,t) such that x+y+z+t = 0 or 1, then the four neighbors of (x,y,z,t) are found by changing one coordinate by +- 1 (such that the sum of coordinates remains 0 or 1). 这个序列给出了从(0,0,0,0)开始的长度为n的自回避步长的数目,使得所有点的t<=z和最后点的t= z。11月11日,2017岁的A.E.V.V.N.J.A.斯隆和Simon Plouffe,《整数序列百科全书》,学术出版社,1995(包括这一序列).%%HA77181 T. Ishinabe和S. G. Whittington,四面体晶格上自回避行走的表面临界指数J. Phys。A 14(1981),439- 464.6%K,A00 7181,NN,AWA77181,1,1%,AO77181,Simon PouffeeE.E%A77181A(21)-A(27),来自于SeaA.IrviNi,11月11日2017‰的内容在OEIS最终用户许可协议下可用:HTTP:/OEIS.Org/许可证