Self-convolution 4th power of A001764, which enumerates ternary trees.
A006629
Self-convolution 4th power of A001764, which enumerates ternary trees.
Terms
- a(0) =1a(1) =4a(2) =18a(3) =88a(4) =455a(5) =2448a(6) =13566a(7) =76912a(8) =444015a(9) =2601300a(10) =15426840a(11) =92431584a(12) =558685348a(13) =3402497504a(14) =20858916870a(15) =128618832864a(16) =797168807855
External references
- oeis: A006629