A051241 Number of relations with 5 arguments on n nodes.

2, 2147516416, 2355796086371179106111063334323891357095101187404796307182832141733986304

Offset: 1

Author

Vladeta Jovovic

Keywords

• nonn
• bref

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..5

Crossrefs

Cf. A000595, A000662, A001377.

Programs

Python

from itertools import product
from math import factorial, prod, lcm
from fractions import Fraction
from sympy.utilities.iterables import partitions
def A051241(n): return int(sum(Fraction(1<Chai Wah Wu, Jul 02 2024