Tetrahedral numbers written backwards.

Terms

a(0) =0a(1) =1a(2) =4a(3) =1a(4) =2a(5) =53a(6) =65a(7) =48a(8) =21a(9) =561a(10) =22a(11) =682a(12) =463a(13) =554a(14) =65a(15) =86a(16) =618a(17) =969a(18) =411a(19) =331a(20) =451a(21) =1771a(22) =4202a(23) =32a(24) =62a(25) =5292a(26) =6723a(27) =4563a(28) =604a(29) =5944