A070285 - OEIS

A070285

a(n) = n^(n-2) * (n-1)^(n-1).

1, 12, 432, 32000, 4050000, 784147392, 215886856192, 80244904034304, 38742048900000000, 23579476910000000000, 17665746626579203620864, 15979082092619945289449472, 17171174753799627467382181888, 21626132883476724540000000000000, 31553580184752881664000000000000000

(list; graph; refs; listen; history; text; internal format)

OFFSET

2,2

COMMENTS

Number of spanning trees in the bipartite graph K(n,n-1).

REFERENCES

J. J. Sylvester, On the change of systems of independent variables, Quarterly Journal of Mathematics, i. (1857), pp. 42-56; Collected Mathematical Papers, Volume 2, Cambridge (1908), pp. 65-85, see page 76.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 2..100

MAPLE

A070285:=n->n^(n-2) * (n-1)^(n-1); seq(A070285(n), n=2..15); # Wesley Ivan Hurt, Feb 26 2014

MATHEMATICA

Table[n^(n - 2)*(n - 1)^(n - 1), {n, 2, 15}]

PROG

(Magma) [n^(n-2) * (n-1)^(n-1): n in [2..20]]; // Vincenzo Librandi, Mar 04 2014

CROSSREFS

Cf. A068087.

Sequence in context: A067429 A054913 A221955 * A241593 A041617 A159534

Adjacent sequences: A070282 A070283 A070284 * A070286 A070287 A070288