OFFSET
0,8
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..3501
EXAMPLE
a(8) = 3: o o o
| | /|\
o o o o o
| /|\ | |
o o o o o o
| | | |
o o o o
| | |
o o o
|
o
|
o
|
o
MAPLE
b:= proc(n, i, t) option remember; `if`(n=0, `if`(t=1, 0, 1), `if`(i<1, 0,
add(b(n-i*j, i-1, max(0, t-j))*binomial(a(i), j), j=0..n/i)))
end:
a:= n-> `if`(n<2, n, b(n-1$2, 3)):
seq(a(n), n=0..50);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Aug 28 2018
STATUS
approved