Number of nondecreasing arrangements of n+2 numbers in 0..8 with each number being the sum mod 9 of two others.

A183911

Number of nondecreasing arrangements of n+2 numbers in 0..8 with each number being the sum mod 9 of two others.

Terms

    a(0) =1a(1) =4a(2) =31a(3) =231a(4) =1093a(5) =3631a(6) =9576a(7) =21660a(8) =43980a(9) =82453a(10) =145376a(11) =244106a(12) =393876a(13) =614764a(14) =932833a(15) =1381461a(16) =2002881a(17) =2849952a(18) =3988183a(19) =5498033a(20) =7477511a(21) =10045101a(22) =13343038a(23) =17540962a(24) =22839978a(25) =29477151a(26) =37730466a(27) =47924284a(28) =60435326a(29) =75699218

External references