Number of ways to split 1, 2, 3, ..., 4n into n arithmetic progressions each with 4 terms.
A104430
Number of ways to split 1, 2, 3, ..., 4n into n arithmetic progressions each with 4 terms.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =23a(6) =68a(7) =161a(8) =488a(9) =1249a(10) =3771a(11) =10388a(12) =35725a(13) =110449a(14) =387057a(15) =1411784a(16) =5938390a(17) =26054261a(18) =129231034a(19) =708657991
External references
- oeis: A104430