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 A271755 Number of set partitions of [n+4] such that n is the largest element of the last block. 2

%I #5 Apr 13 2016 15:01:36

%S 0,1,18,149,1039,6932,46299,315597,2215148,16075611,120829511,

%T 941052026,7592454845,63417026389,547926762922,4892438131137,

%U 45101313988931,428831073340204,4201412824028351,42374784500354529,439570765566102348,4685781221854745135

%N Number of set partitions of [n+4] such that n is the largest element of the last block.

%H Alois P. Heinz, <a href="/A271755/b271755.txt">Table of n, a(n) for n = 1..573</a>

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a>

%F a(n) = A271466(n+4,n).

%e a(3) = 18: 124567|3, 14567|23, 14567|2|3, 1456|27|3, 1457|26|3, 145|267|3, 1467|25|3, 146|257|3, 147|256|3, 14|2567|3, 1567|24|3, 156|247|3, 157|246|3, 15|2467|3, 167|245|3, 16|2457|3, 17|2456|3, 1|24567|3.

%Y A diagonal of A271466.

%K nonn

%O 1,3

%A _Alois P. Heinz_, Apr 13 2016

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Last modified May 29 13:31 EDT 2024. Contains 372940 sequences. (Running on oeis4.)