Fifth diagonal of triangle A064094.

Terms

a(0) =1a(1) =14a(2) =67a(3) =190a(4) =413a(5) =766a(6) =1279a(7) =1982a(8) =2905a(9) =4078a(10) =5531a(11) =7294a(12) =9397a(13) =11870a(14) =14743a(15) =18046a(16) =21809a(17) =26062a(18) =30835a(19) =36158a(20) =42061a(21) =48574a(22) =55727a(23) =63550a(24) =72073a(25) =81326a(26) =91339a(27) =102142a(28) =113765a(29) =126238