A092884 Number of ordered 6-multiantichains on an n-set.

1, 2, 66, 1646, 88506, 8613902, 1231105866, 188154436766, 25336884739386, 2899961354741102, 288699413276365866, 25796553272150692286, 2124750221415528346266, 164635721219625224450702

Offset

0,2

Links

Table of n, a(n) for n=0..13.

Formula

a(n) = 64^n - 30*48^n + 120*40^n + 60*36^n + 60*34^n - 12*33^n - 330*32^n - 720*30^n + 810*28^n + 120*27^n + 480*26^n + 360*25^n - 780*24^n - 720*23^n - 240*22^n - 540*21^n + 2280*20^n + 750*19^n + 360*18^n - 60*17^n - 3120*16^n - 3620*15^n + 4500*14^n + 3600*13^n - 7200*12^n + 600*11^n + 7200*10^n + 1200*9^n - 5970*8^n + 1800*7^n - 7380*6^n + 7380*5^n + 2040*4^n - 4080*3^n + 1082*2^n.

Crossrefs

Cf. A092880-A092883.

Sequence in context: A154637 A069865 A218433 * A230735 A361884 A261784

Adjacent sequences: A092881 A092882 A092883 * A092885 A092886 A092887

Keyword

nonn

Author

Goran Kilibarda, Vladeta Jovovic, Mar 10 2004

Status

approved