INVERT transform of A058187, the tetrahedral numbers with repeats.

Terms

a(0) =1a(1) =2a(2) =7a(3) =17a(4) =46a(5) =119a(6) =311a(7) =812a(8) =2118a(9) =5530a(10) =14431a(11) =37668a(12) =98313a(13) =256602a(14) =669742a(15) =1748052a(16) =4562490a(17) =11908280a(18) =31081099a(19) =81122927a(20) =211734137a(21) =552634698a(22) =1442399007a(23) =3764720003a(24) =9826072122a(25) =25646447377