1/4 the number of arrangements of 7 nonzero numbers x(i) in -n..n with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero.
A189956
1/4 the number of arrangements of 7 nonzero numbers x(i) in -n..n with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero.
Terms
- a(0) =32a(1) =1152a(2) =13569a(3) =73992a(4) =280284a(5) =839968a(6) =2095080a(7) =4678100a(8) =9483181a(9) =17859030a(10) =31526421a(11) =53335818a(12) =86113621a(13) =134395470a(14) =203331437a(15) =299865250a(16) =431183908a(17) =608327784a(18) =840894817a(19) =1144932377a(20) =1534996553a(21) =2030482093a(22) =2648947079
External references
- oeis: A189956