Triangle read by rows: T(n,k) is the number of non-crossing set partitions of {1..4n} into n sets of 4 with k of the sets being a contiguous set of elements.
A334062
Triangle read by rows: T(n,k) is the number of non-crossing set partitions of {1..4n} into n sets of 4 with k of the sets being a contiguous set of elements.
Terms
- a(0) =1a(1) =3a(2) =1a(3) =9a(4) =12a(5) =1a(6) =27a(7) =81a(8) =31a(9) =1a(10) =81a(11) =432a(12) =390a(13) =65a(14) =1a(15) =243a(16) =2025a(17) =3330a(18) =1365a(19) =120a(20) =1a(21) =729a(22) =8748a(23) =22815a(24) =17415a(25) =3909a(26) =203a(27) =1a(28) =2187a(29) =35721
External references
- oeis: A334062