%I #5 Jun 23 2025 22:35:40

%S 0,4,42,176,540,1152,2534,4608,6984,12580,19250,26016,39988,55076,

%T 63570,97920,127024,155088,203946,253360,289044,378884,456918,528672,

%U 648200,763620,869022,1040368,1204196,1318440,1588750,1812224,2013132,2329476,2626330,2910672,3303804,3687748,4039854,4555520,5043000,5471088,6133778,6740976,7295760,8090020,8836094,9544128,10481296,11384900

%N A344857(2*n).

%C No formula is known.

%Y Cf. A344857, A344866.

%K nonn,more

%O 1,2

%A _Scott R. Shannon_ and _N. J. A. Sloane_, Sep 12 2021, extended Jun 23 2025