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A271753 Number of set partitions of [n+2] such that n is the largest element of the last block. 2
0, 1, 6, 29, 139, 692, 3627, 20085, 117488, 724731, 4703699, 32043002, 228572813, 1703454469, 13235230990, 106997762361, 898404819935, 7821618182572, 70498093658879, 656892909516441, 6319385054660256, 62688326727955007, 640525850674446471, 6733883466256420010 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
FORMULA
a(n) = A271466(n+2,n).
EXAMPLE
a(3) = 6: 1245|3, 145|23, 145|2|3, 14|25|3, 15|24|3, 1|245|3.
a(4) = 29: 12356|4, 1256|34, 1256|3|4, 125|36|4, 126|35|4, 12|356|4, 1356|24, 1356|2|4, 135|26|4, 136|25|4, 13|256|4, 156|234, 156|23|4, 15|236|4, 16|235|4, 1|2356|4, 156|2|34, 15|26|34, 16|25|34, 1|256|34, 156|2|3|4, 15|26|3|4, 15|2|36|4, 16|25|3|4, 1|256|3|4, 1|25|36|4, 16|2|35|4, 1|26|35|4, 1|2|356|4.
CROSSREFS
A diagonal of A271466.
Sequence in context: A359920 A110311 A030221 * A367469 A009153 A012325
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Apr 13 2016
STATUS
approved

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Last modified May 24 21:45 EDT 2024. Contains 372782 sequences. (Running on oeis4.)