Diagonal sums of inverse of Riordan array (1/(1-x^4),x/(1-x^4)).

Terms

a(0) =1a(1) =1a(2) =0a(3) =-1a(4) =2a(5) =6a(6) =-11a(7) =-35a(8) =73a(9) =232a(10) =-516a(11) =-1646a(12) =3825a(13) =12239a(14) =-29344a(15) =-94137a(16) =231050a(17) =742825a(18) =-1856679a(19) =-5980056a(20) =15166101a(21) =48922556a(22) =-125557710a(23) =-405553786a(24) =1051197507a(25) =3399234751