Number of derangements of {1,2,...,n} having no adjacent 3-cycles (an adjacent 3-cycle is a cycle of the form (i,i+1,i+2)).
A177259
Number of derangements of {1,2,...,n} having no adjacent 3-cycles (an adjacent 3-cycle is a cycle of the form (i,i+1,i+2)).
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =9a(5) =41a(6) =258a(7) =1809a(8) =14575a(9) =131660a(10) =1320264a(11) =14551987a(12) =174887262a(13) =2276174790a(14) =31895551245a(15) =478783042890
External references
- oeis: A177259