Number of set partitions of [5n] into 5-element subsets {i, i+k, i+2k, i+3k, i+4k} with 1<=k<=n.
A349430
Number of set partitions of [5n] into 5-element subsets {i, i+k, i+2k, i+3k, i+4k} with 1<=k<=n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =20a(6) =58a(7) =124a(8) =344a(9) =811a(10) =2071a(11) =4973a(12) =15454a(13) =36031a(14) =96212a(15) =237563a(16) =668695a(17) =1626751a(18) =4674373a(19) =11470722a(20) =31460456a(21) =81705943a(22) =224598113
External references
- oeis: A349430