a(n) = (5*n + 9)*binomial(n+8, 8)/9.

Terms

a(0) =1a(1) =14a(2) =95a(3) =440a(4) =1595a(5) =4862a(6) =13013a(7) =31460a(8) =70070a(9) =145860a(10) =286858a(11) =537472a(12) =965770a(13) =1673140a(14) =2806870a(15) =4576264a(16) =7272991a(17) =11296450a(18) =17185025a(19) =25654200a(20) =37642605a(21) =54367170a(22) =77388675a(23) =108689100a(24) =150762300a(25) =206719656a(26) =280412484a(27) =376573120a(28) =500976740a(29) =660626120