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

Author

N. J. A. Sloane, May 30 2014

Keywords

• nonn

Comments

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

Crossrefs

Cf. A008302.

Programs

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)];