Number of set partitions of [n] into exactly five blocks such that all odd elements are in blocks with an odd index and all even elements are in blocks with an even index.
A274869
Number of set partitions of [n] into exactly five blocks such that all odd elements are in blocks with an odd index and all even elements are in blocks with an even index.
Terms
- a(0) =1a(1) =2a(2) =13a(3) =26a(4) =113a(5) =226a(6) =833a(7) =1666a(8) =5649a(9) =11298a(10) =36561a(11) =73122a(12) =230161a(13) =460322a(14) =1424401a(15) =2848802a(16) =8720657a(17) =17441314a(18) =53021969a(19) =106043938a(20) =320925969a(21) =641851938a(22) =1936736529a(23) =3873473058a(24) =11665150225a(25) =23330300450a(26) =70169841937a(27) =140339683874a(28) =421734846737
External references
- oeis: A274869