a(n) equals half the sum of the squares of the terms in row n of irregular triangle A391810.

A391811

a(n) equals half the sum of the squares of the terms in row n of irregular triangle A391810.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =13a(4) =53a(5) =199a(6) =674a(7) =2313a(8) =8731a(9) =34453a(10) =135151a(11) =516056a(12) =1929917a(13) =7191767a(14) =27150041a(15) =104424657a(16) =407094655a(17) =1594363303a(18) =6233521880a(19) =24277356505a(20) =94261319494a(21) =365585759896

External references