A242656 Mahonian numbers T(n,6) (cf. A008302).

1, 20, 90, 259, 602, 1230, 2298, 4015, 6655, 10569, 16198, 24087, 34900, 49436, 68646, 93651, 125761, 166495, 217602, 281083, 359214, 454570, 570050, 708903, 874755, 1071637, 1304014, 1576815, 1895464, 2265912, 2694670, 3188843, 3756165, 4405035, 5144554, 5984563, 6935682

Offset

4,2

Comments

45 years ago this was A000711, but it was dropped during the preparation of the 1973 Handbook of Integer Sequences.

Links

Table of n, a(n) for n=4..40.

Maple

g := proc(n, k) option remember; if k=0 then return(1) else if (n=1 and k=1) then return(0) else if (k<0 or k>binomial(n, 2)) then return(0) else g(n-1, k)+g(n, k-1)-g(n-1, k-n) end if end if end if end proc;
[seq(g(n, 6), n=4..40)];

Crossrefs

Cf. A008302.

Sequence in context: A213839 A264302 A220200 * A264851 A345286 A338485

Adjacent sequences: A242653 A242654 A242655 * A242657 A242658 A242659

Keyword

nonn

Author

N. J. A. Sloane, May 30 2014

Status

approved