Column 13 of array illustrated in A089574 and related to A034261.

Terms

a(0) =2a(1) =148a(2) =2159a(3) =16746a(4) =90371a(5) =383147a(6) =1364679a(7) =4256436a(8) =11952264a(9) =30812675a(10) =73980045a(11) =167235586a(12) =358959637a(13) =736521122a(14) =1452480779a(15) =2765433413a(16) =5102243735a(17) =9150977405a(18) =15997148389a(19) =27320179543a(20) =45672422411a(21) =74869958841a(22) =120533007335a(23) =190824424010a(24) =297447916702a(25) =456983633899a(26) =692658264469