Diagonal sums of Bessel related triangle A122848.

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =1a(5) =3a(6) =4a(7) =6a(8) =16a(9) =25a(10) =46a(11) =120a(12) =211a(13) =441a(14) =1156a(15) =2233a(16) =5104a(17) =13581a(18) =28351a(19) =69345a(20) =188101a(21) =419320a(22) =1082566a(23) =2998776a(24) =7074211a(25) =19099158a(26) =54057004a(27) =133993951a(28) =375814531