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%I #9 Nov 18 2020 19:47:01
%S 1,1,2,4,10,20,56,117,323,745,1896,4242,12883,29108,75725,183366,
%T 504215,1176776
%N Number of ways to split 1, 2, 3, ..., 7n into n arithmetic progressions each with 7 terms.
%Y Cf. A104429-A104432, A104434-A104443.
%K nonn,more
%O 0,3
%A _Jonas Wallgren_, Mar 17 2005
%E a(0), a(11)-a(17) from _Alois P. Heinz_, Nov 18 2020
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