Number of 2-factors in C_5 X P_n.

Terms

a(0) =1a(1) =11a(2) =81a(3) =666a(4) =5431a(5) =44466a(6) =364061a(7) =2981201a(8) =24412606a(9) =199912706a(10) =1637069691a(11) =13405842666a(12) =109779463516a(13) =898976005896