A018996 - OEIS

%I #14 Mar 17 2019 12:25:58

%S 3,9,52,291,1445,6420,32959,187727,1102665,6930612,46522650,320194002,

%T 2204132941,15091491681,102924219886

%N Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite BPH = Beryllophosphate-H Na7K7 [ Be14P14O56 ] . 20 H2O.

%D G. Thimm and W. E. Klee, Zeolite cycle sequences, Zeolites, 19, pp. 422-424, 1997.

%H G. Thimm, <a href="/thimm1.html">Cycle sequences of crystal structures</a>

%Y Cf. A018966. [_R. J. Mathar_, Oct 26 2008]

%K nonn,more

%O 2,1

%A Georg Thimm (mgeorg(AT)ntu.edu.sg)

%E a(11)-a(16) from _Sean A. Irvine_, Mar 17 2019