References to A004253

a(n) = 5*a(n-1) - a(n-2).
1, 4, 19, 91, 436, 2089, 10009, 47956, 229771, 1100899, 5274724, 25272721


2 seqfan posts

Thu Mar 10 23:29:24 CET 2011    [seqfan] NOT Re: Toroidal crossing number of K_n
Sun Jan 11 23:36:02 CET 2009    [seqfan] Index of linear recurrences

Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
Links to OEIS content are included according to The OEIS End-User License Agreement .