Number of arrangements of n+2 nonzero numbers x(i) in -3..3 with the sum of x(i)*x(i+1) equal to zero.
A188243
Number of arrangements of n+2 nonzero numbers x(i) in -3..3 with the sum of x(i)*x(i+1) equal to zero.
Terms
- a(0) =36a(1) =52a(2) =548a(3) =1632a(4) =12692a(5) =51196a(6) =355396a(7) =1657632a(8) =10858368a(9) =54754656a(10) =346608044a(11) =1831830172a(12) =11344750308a(13) =61835276360a(14) =377379008580
External references
- oeis: A188243