Apply partial sum operator thrice to partition numbers.

Terms

a(0) =1a(1) =4a(2) =11a(3) =25a(4) =51a(5) =96a(6) =171a(7) =291a(8) =478a(9) =762a(10) =1185a(11) =1803a(12) =2693a(13) =3956a(14) =5727a(15) =8182a(16) =11552a(17) =16134a(18) =22313a(19) =30579a(20) =41559a(21) =56045a(22) =75039a(23) =99796a(24) =131891a(25) =173282a(26) =226405a(27) =294270a(28) =380595a(29) =489945