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A089835
a(n) = (A000108(n)^2)*(n+1)!.
5
1, 2, 24, 600, 23520, 1270080, 87816960, 7420533120, 742053312000, 85781362867200, 11260753452748800, 1655330757554073600, 269436914075724595200, 48113734656379392000000
OFFSET
0,2
COMMENTS
This sequence gives the total number of non-recursive "clauses" of n opening nodes, used in the construction of A089840.
FORMULA
a(n) = A001246(n)*A000142(n+1) = A001813(n)*A000108(n).
PROG
(MIT/GNU Scheme) (define (A089835 n) (* (A000108 n) (A000108 n) (A000142 (1+ n))))
CROSSREFS
INVERTi transform of A089836.
Sequence in context: A090316 A128578 A186632 * A210909 A009251 A009447
KEYWORD
nonn
AUTHOR
Antti Karttunen, Dec 05 2003
STATUS
approved