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 A260039 Triangle read by rows giving numbers B(n,k) arising in the enumeration of doubly rooted tree maps. 6
 1, 8, 2, 72, 30, 3, 720, 380, 72, 4, 7780, 4690, 1245, 140, 5, 89040, 58254, 19152, 3192, 240, 6, 1064644, 734496, 279972, 60648, 7000, 378, 7, 13173216, 9416688, 3997584, 1046832, 162000, 13752, 560, 8, 167522976, 122687334, 56488950, 17086608, 3285990, 382140, 24885, 792, 9 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS See Mullin (1967) for precise definition. What is the sequence 1, 8, 72, 720, 7780, 89040, 1064644, 13173216, 167522976, 2178520080, ... in the leading diagonal? LINKS Table of n, a(n) for n=1..45. R. C. Mullin, On the average activity of a spanning tree of a rooted map, J. Combin. Theory, 3 (1967), 103-121. [Annotated scanned copy] [DOI] FORMULA T(n,k) = (k+1)*A260040(n,k), n>=1, 0<=k

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Last modified March 4 05:23 EST 2024. Contains 370522 sequences. (Running on oeis4.)