a(n) = - 4*a(n-2) - a(n-4), a(0) = 1, a(1) = -4, a(2) = -6, a(3) = 15.
1, 4, 6, 15, 23, 56, 86, 209, 321, 780, 1198, 2911, 4471, 10864, 16686
1 seqfan posts
Thu Nov 19 17:19:12 CET 2009 [seqfan] detective work related to Creighton Dement's "Floretions"