Number of set partitions of [n] such that the difference between each element and its block index is a multiple of nine.

A274842

Number of set partitions of [n] such that the difference between each element and its block index is a multiple of nine.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =2a(11) =3a(12) =4a(13) =5a(14) =6a(15) =7a(16) =8a(17) =9a(18) =10a(19) =21a(20) =42a(21) =81a(22) =152a(23) =279a(24) =502a(25) =885a(26) =1524a(27) =2547a(28) =6629a(29) =15815

External references