Third diagonal of A027446.

Terms

a(0) =11a(1) =13a(2) =47a(3) =37a(4) =214a(5) =365a(6) =955a(7) =847a(8) =8372a(9) =7602a(10) =90510a(11) =83490a(12) =77484a(13) =144573a(14) =2303301a(15) =2167165a(16) =38878840a(17) =36824788a(18) =34977228a(19) =33306468a(20) =731129880a(21) =699259470a(22) =3350272926a(23) =3215969526a(24) =9276087128a(25) =8931886700a(26) =249757779700a(27) =241131522060