Signed recurrence over binary enriched p-trees: a(n) = (-1)^(n-1) + Sum_{x + y = n, 0 < x <= y < n} a(x) * a(y).
A300865
Signed recurrence over binary enriched p-trees: a(n) = (-1)^(n-1) + Sum_{x + y = n, 0 < x <= y < n} a(x) * a(y).
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =1a(6) =2a(7) =2a(8) =4a(9) =6a(10) =10a(11) =16a(12) =27a(13) =46a(14) =77a(15) =131a(16) =224a(17) =391a(18) =672a(19) =1180a(20) =2050a(21) =3626a(22) =6344a(23) =11276a(24) =19863a(25) =35479a(26) =62828a(27) =112685a(28) =200462a(29) =360627
External references
- oeis: A300865