Signed recurrence over enriched p-trees: a(n) = (-1)^(n - 1) + Sum_{y1 + ... + yk = n, y1 >= ... >= yk > 0, k > 1} a(y1) * ... * a(yk).
A300863
Signed recurrence over enriched p-trees: a(n) = (-1)^(n - 1) + Sum_{y1 + ... + yk = n, y1 >= ... >= yk > 0, k > 1} a(y1) * ... * a(yk).
Terms
- a(0) =1a(1) =0a(2) =2a(3) =2a(4) =6a(5) =14a(6) =34a(7) =82a(8) =214a(9) =566a(10) =1482a(11) =4058a(12) =10950a(13) =30406a(14) =83786a(15) =235714a(16) =658286a(17) =1874254a(18) =5293674a(19) =15189810a(20) =43312542a(21) =125075238a(22) =359185586a(23) =1043712922a(24) =3015569582a(25) =8800146182a(26) =25565402802a(27) =74918274562a(28) =218572345718a(29) =642783954238
External references
- oeis: A300863