Number of "rooted index-functional forests" (Riffs) on n nodes. Number of "rooted odd trees with only exponent symmetries" (Rotes) on 2n+1 nodes.
A061396
Number of "rooted index-functional forests" (Riffs) on n nodes. Number of "rooted odd trees with only exponent symmetries" (Rotes) on 2n+1 nodes.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =73a(6) =281a(7) =1124a(8) =4618a(9) =19387a(10) =82765a(11) =358245a(12) =1568458a(13) =6933765a(14) =30907194a(15) =138760603a(16) =626898401a(17) =2847946941a(18) =13001772692a(19) =59618918444a(20) =274463781371
External references
- oeis: A061396