Triangle of central factorial numbers |4^k t(2n+1,2n+1-2k)| read by rows (n>=0, k=0..n).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =10a(5) =9a(6) =1a(7) =35a(8) =259a(9) =225a(10) =1a(11) =84a(12) =1974a(13) =12916a(14) =11025a(15) =1a(16) =165a(17) =8778a(18) =172810a(19) =1057221a(20) =893025a(21) =1a(22) =286a(23) =28743a(24) =1234948a(25) =21967231a(26) =128816766a(27) =108056025a(28) =1a(29) =455