a(0) = 1, a(1) = 4; thereafter a(n)*(2n + 10) - a(n-1)*(11n + 35) + a(n-2)*(8n + 2) + a(n-3)*(15n + 7) + a(n-4)*(4n - 2) = 0.

A001559

a(0) = 1, a(1) = 4; thereafter a(n)*(2n + 10) - a(n-1)*(11n + 35) + a(n-2)*(8n + 2) + a(n-3)*(15n + 7) + a(n-4)*(4n - 2) = 0.

Terms

    a(0) =1a(1) =4a(2) =15a(3) =54a(4) =193a(5) =690a(6) =2476a(7) =8928a(8) =32358a(9) =117866a(10) =431381a(11) =1585842a(12) =5853849a(13) =21690378a(14) =80650536a(15) =300845232a(16) =1125555054a(17) =4222603968a(18) =15881652606a(19) =59873283372a(20) =226214536506a(21) =856431978324

External references