Number of strings of n+2 numbers x(i) in -1..1 with the sum of x(i) equal to zero and the sums of x(i)*x(i+1) and x(i)*x(i+2) equal to each other.
A184053
Number of strings of n+2 numbers x(i) in -1..1 with the sum of x(i) equal to zero and the sums of x(i)*x(i+1) and x(i)*x(i+2) equal to each other.
Terms
- a(0) =1a(1) =3a(2) =11a(3) =21a(4) =61a(5) =179a(6) =447a(7) =1243a(8) =3359a(9) =9465a(10) =25445a(11) =70661a(12) =201081a(13) =558071a(14) =1590047a(15) =4493647a(16) =12802275a(17) =36449535a(18) =103943735a(19) =298249607a(20) =853537659a(21) =2455980115a(22) =7066375759a(23) =20376225441a(24) =58856195841a(25) =170131643499a(26) =492840266543
External references
- oeis: A184053