Moessner triangle based on A000217.

Terms

a(0) =1a(1) =3a(2) =6a(3) =13a(4) =28a(5) =21a(6) =69a(7) =161a(8) =137a(9) =55a(10) =433a(11) =1078a(12) =1017a(13) =477a(14) =120a(15) =3141a(16) =8245a(17) =8437a(18) =4460a(19) =1337a(20) =231a(21) =25873a(22) =71008a(23) =77620a(24) =45058a(25) =15415a(26) =3220a(27) =406a(28) =238629a(29) =680451