Ordered set partitions of the set {1, 2, ..., 4*n} with all block sizes divisible by 4, irregular triangle T(n, k) for n >= 0 and 0 <= k < A000041(n), read by rows.

A327024

Ordered set partitions of the set {1, 2, ..., 4*n} with all block sizes divisible by 4, irregular triangle T(n, k) for n >= 0 and 0 <= k < A000041(n), read by rows.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =70a(4) =1a(5) =990a(6) =34650a(7) =1a(8) =3640a(9) =12870a(10) =2702700a(11) =63063000a(12) =1a(13) =9690a(14) =251940a(15) =26453700a(16) =187065450a(17) =17459442000a(18) =305540235000a(19) =1a(20) =21252a(21) =1470942a(22) =2704156a(23) =154448910a(24) =8031343320a(25) =9465511770a(26) =374796021600

External references