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a(n) has generating function 1/((1-x)^k*(1-x^2)^(k*(k-1)/2)) for k=7.
4

%I #12 Feb 08 2017 19:09:11

%S 1,7,49,231,1029,3843,13573,43219,131131,370909,1007083,2596573,

%T 6466159,15465961,35906959,80682553,176682268,376497604,784435036,

%U 1596836164,3186750028,6232957588,11978020684,22615355476,42031123204,76900938268

%N a(n) has generating function 1/((1-x)^k*(1-x^2)^(k*(k-1)/2)) for k=7.

%H Alois P. Heinz, <a href="/A181479/b181479.txt">Table of n, a(n) for n = 0..1000</a>

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Schur_polynomial">Schur Polynomial</a>

%t CoefficientList[Series[1/(1-x)^7/(1-x^2)^21,{x,0,16}],x]; see also A181477.

%Y Column k=7 of A210391. - _Alois P. Heinz_, Mar 22 2012

%K nonn,easy

%O 0,2

%A _Wouter Meeussen_, Oct 24 2010