Convolution of triangular numbers with partition numbers.

Terms

a(0) =1a(1) =5a(2) =15a(3) =36a(4) =75a(5) =143a(6) =255a(7) =433a(8) =707a(9) =1119a(10) =1725a(11) =2602a(12) =3851a(13) =5607a(14) =8046a(15) =11399a(16) =15963a(17) =22123a(18) =30369a(19) =41328a(20) =55792a(21) =74763a(22) =99496a(23) =131566a(24) =172931a(25) =226027a(26) =293864a(27) =380160a(28) =489480a(29) =627428