Convolution of nonzero squares (A000290) with nonzero pentagonal numbers (A000326).

Terms

a(0) =1a(1) =9a(2) =41a(3) =131a(4) =336a(5) =742a(6) =1470a(7) =2682a(8) =4587a(9) =7447a(10) =11583a(11) =17381a(12) =25298a(13) =35868a(14) =49708a(15) =67524a(16) =90117a(17) =118389a(18) =153349a(19) =196119a(20) =247940a(21) =310178a(22) =384330a(23) =472030a(24) =575055a(25) =695331a(26) =834939a(27) =996121a(28) =1181286a(29) =1393016