a(n) is the number of "merger histories" of n elements (see A256006) where at most 3 elements can merge at the same time.
A358072
a(n) is the number of "merger histories" of n elements (see A256006) where at most 3 elements can merge at the same time.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =28a(4) =320a(5) =5360a(6) =123760a(7) =3765440a(8) =145951680a(9) =7019678400a(10) =410164339200
External references
- oeis: A358072