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; triangle C_t(n), t>=0, 0<=n<=t, read by rows.
A261275
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; triangle C_t(n), t>=0, 0<=n<=t, read by rows.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =2a(5) =3a(6) =0a(7) =4a(8) =10a(9) =11a(10) =0a(11) =8a(12) =36a(13) =48a(14) =49a(15) =0a(16) =16a(17) =136a(18) =236a(19) =256a(20) =257a(21) =0a(22) =32a(23) =528a(24) =1248a(25) =1508a(26) =1538a(27) =1539a(28) =0a(29) =64
External references
- oeis: A261275