Column 0 of the irregular triangle A355588.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =5a(8) =35a(9) =35a(10) =35a(11) =7a(12) =55a(13) =11a(14) =5005a(15) =5005a(16) =5005a(17) =5005a(18) =85085a(19) =85085a(20) =323323a(21) =323323a(22) =46189a(23) =46189a(24) =437437a(25) =572033a(26) =185910725a(27) =185910725a(28) =26558675a(29) =185910725