
FORMULA

Faase gives a 12term linear recurrence on his web page:
If b(n) denotes the number of spanning trees with degrees 1 and 3 in C_5 X P_n we have:
b(1) = 0,
b(2) = 0,
b(3) = 0,
b(4) = 260,
b(5) = 0,
b(6) = 27420,
b(7) = 0,
b(8) = 2504560,
b(9) = 0,
b(10) = 223723080,
b(11) = 0,
b(12) = 19923617840,
b(13) = 0,
b(14) = 1773563554900,
b(15) = 0,
b(16) = 157870122686600,
b(17) = 0,
b(18) = 14052371971981100,
b(19) = 0,
b(20) = 1250831588811052320,
b(21) = 0,
b(22) = 111339169110472830220,
b(23) = 0,
b(24) = 9910535055491682625400,
b(25) = 0,
b(26) = 882157695038695625086700, and
b(n) = 98b(n2)  745b(n4)  4916b(n6)  234b(n8) + 160624b(n10)
 26648b(n12) + 338976b(n14)  1265216b(n16)  2291392b(n18)  1695488b(n20)
 307200b(n22) + 32768b(n24).
