A104431 - OEIS

%I #16 Nov 24 2023 09:41:32

%S 1,1,2,4,10,21,59,125,349,848,2224,5210,15720,37096,98241,245251,

%T 684475,1703174,4915084,12024901,33594399

%N Number of ways to split 1, 2, 3, ..., 5n into n arithmetic progressions each with 5 terms.

%Y Cf. A104429-A104430, A104432-A104443, A349430.

%K nonn,more

%O 0,3

%A _Jonas Wallgren_, Mar 17 2005

%E a(11)-a(18) from _Alois P. Heinz_, Dec 28 2011

%E a(19)-a(20) from _Alois P. Heinz_, Nov 18 2021