a(0)=1, a(n)=A002445(n)/6 for n>=1.

Terms

a(0) =1a(1) =1a(2) =5a(3) =7a(4) =5a(5) =11a(6) =455a(7) =1a(8) =85a(9) =133a(10) =55a(11) =23a(12) =455a(13) =1a(14) =145a(15) =2387a(16) =85a(17) =1a(18) =319865a(19) =1a(20) =2255a(21) =301a(22) =115a(23) =47a(24) =7735a(25) =11a(26) =265a(27) =133a(28) =145a(29) =59