Partial sums of A054469.

Terms

a(0) =1a(1) =8a(2) =36a(3) =121a(4) =339a(5) =838a(6) =1891a(7) =3983a(8) =7953a(9) =15225a(10) =28183a(11) =50779a(12) =89518a(13) =155053a(14) =264767a(15) =446952a(16) =747572a(17) =1241207a(18) =2048762a(19) =3366122a(20) =5510518a(21) =8995550a(22) =14652578a(23) =23827138a(24) =38696751a(25) =62785150a(26) =101794318a(27) =164950755a(28) =267183785a(29) =432650132