Number triangle of sums of squared binomial coefficients.

Terms

a(0) =1a(1) =2a(2) =1a(3) =3a(4) =5a(5) =1a(6) =4a(7) =14a(8) =10a(9) =1a(10) =5a(11) =30a(12) =46a(13) =17a(14) =1a(15) =6a(16) =55a(17) =146a(18) =117a(19) =26a(20) =1a(21) =7a(22) =91a(23) =371a(24) =517a(25) =251a(26) =37a(27) =1a(28) =8a(29) =140