Number of set partitions C'_t(n) of {1,2,...,t} into at most n parts, with an even number of elements in each part distinguished by marks and such that no part contains both 1 and t (each unmarked) or both i and i+1 (each unmarked) for some i with 1 <= i < t; triangle C'_t(n), t>=0, 0<=n<=t, read by rows.
A261319
Number of set partitions C'_t(n) of {1,2,...,t} into at most n parts, with an even number of elements in each part distinguished by marks and such that no part contains both 1 and t (each unmarked) or both i and i+1 (each unmarked) for some i with 1 <= i < t; triangle C'_t(n), t>=0, 0<=n<=t, read by rows.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =2a(6) =0a(7) =0a(8) =3a(9) =4a(10) =0a(11) =1a(12) =11a(13) =19a(14) =20a(15) =0a(16) =0a(17) =30a(18) =80a(19) =95a(20) =96a(21) =0a(22) =1a(23) =92a(24) =372a(25) =527a(26) =551a(27) =552a(28) =0a(29) =0
External references
- oeis: A261319