Triangle of succession numbers for circular permutations.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =0a(5) =1a(6) =1a(7) =0a(8) =0a(9) =1a(10) =1a(11) =4a(12) =0a(13) =0a(14) =1a(15) =8a(16) =5a(17) =10a(18) =0a(19) =0a(20) =1a(21) =36a(22) =48a(23) =15a(24) =20a(25) =0a(26) =0a(27) =1a(28) =229a(29) =252