A327418 - OEIS

%I #8 Mar 24 2020 08:03:43

%S 1,1,8255,2941884000,11957867341948125,294040106448733743008625,

%T 30188472144950452369737153667500,

%U 10143939867539251013312279527292897925000,9389957475743686923255643914812959599614184703125,21058194888200109612591474039339954750056969537259132421875

%N a(n) = A291452(2*n, n).

%o (Sage) # uses[P from A327416]

%o def A327418(n): return P(4, 2*n).list()[n]//factorial(n)

%o print([A327418(n) for n in range(10)])

%Y Cf. A007820 (m=1), A327416 (m=2), A327417 (m=3), this sequence (m=4).

%Y Associated triangles: A048993 (m=1), A156289 (m=2), A291451 (m=3), A291452 (m=4).

%K nonn

%O 0,3

%A _Peter Luschny_, Sep 14 2019