Convolution of natural numbers with A023532.

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =10a(5) =14a(6) =19a(7) =25a(8) =31a(9) =38a(10) =46a(11) =55a(12) =65a(13) =75a(14) =86a(15) =98a(16) =111a(17) =125a(18) =140a(19) =155a(20) =171a(21) =188a(22) =206a(23) =225a(24) =245a(25) =266a(26) =287a(27) =309a(28) =332a(29) =356