Number of solutions to e(1)*1 + e(2)*2 + ... + e(n)*n = e(-1)*1 + e(-2)*2 + ... + e(-n)*n, where e(j) are from {-1,0,1}, j=-n,...,n.
A156181
Number of solutions to e(1)*1 + e(2)*2 + ... + e(n)*n = e(-1)*1 + e(-2)*2 + ... + e(-n)*n, where e(j) are from {-1,0,1}, j=-n,...,n.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =65a(4) =403a(5) =2669a(6) =18759a(7) =136477a(8) =1020373a(9) =7785741a(10) =60395165a(11) =474817833a(12) =3775005799a(13) =30298719855a(14) =245167429681
External references
- oeis: A156181